Like many sports, paintball has its own terminology.  To understand what people are saying, here is a guide to some of the most common terms.
 

"Gogged" or "Goggled" - when a player has been hit square in the goggles.

"Spoolge" - the goo and mess that results when a paintball breaks in the barrel.

"Squeegee" - the tool used to remove splooge.  There are two basic types, "pull-through" and "straight shot" squeegees.  A "straight shot" is a rigid stick (often plastic) with a rubber disk on the end.  The rubber disk pivots, and the shaft is inserted into the end of the barrel.  Once in the barrel, the disk pivots to perpendicular with the stick, and then is pulled out, cleaning all the splooge with it.  A "pull-through" is a series of rubber and neoprene disks on a flexible plastic or metallic wire.  To use, the barrel is removed from the gun and one end of the squeegee is threaded through the barrel.  The player then pulls on that end, pulling the disks through the barrel and cleaning it.  There is another kind of squeegee that some players have called a "possum tail".  It is a pull- through squeegee with a furry cotton ball on the end.  It is supposed to wipe up any residual splooge after the disks go through.

"Flank" - the area on either side of a player or a group of players.  "Turning the flank" means moving around to the side of the player(s), which is also sometimes called "Getting Around On" them.

"Flag Station" - the "home base" of each team.  In "center-flag" paintball, the object is to capture the flag at the middle of the field, and then hang it on your opponents' Flag Station.

"Staging Area" - the area outside of the field where players get prepared to play.

"Tape" or "Wire" - the boundaries of the field, which are usually marked by some sort of colorful tape or rope.

"Push" - an aggressive, offensive move.  Usage:  "THEY'RE PUSHING UP THE MIDDLE!", or "PUSH, PUSH, PUSH!!!!".

"Hold" - a maneuver which keeps opposing players held at bay.  Usage:  "Hold him there!".

"Bunkered" - a move which is designed to force an opponent to remain behind their bunker - usually by "hosing" the area.  Usage:  "Bunker the guy on the right!" or "I'M BUNKERED!".

"Floater" - the word "floater " has two meanings.  It can mean a person who has no assigned position, and can "float" around the field.  It can also refer to a paintball with low velocity, which just seems to "float" through the air.

"Tape Man" - the player whose assigned position is to patrol the "wire" or "tape", or the boundary.

"Slot" - the center of the field.

"Bouncer" - a paintball that hits an opponent, but does not break.

"Newbie" or "Robbie Newbie" - someone with less than a year's experience in the sport.

"Low Crawler" - a person who crawls across the field on his stomach.

"Spotter" - the player who sits at the end of the field and directs his teammates.

"Cover" - anything that protects a player from incoming paintballs.  It is different from "concealment", although cover CAN also provide concealment.  For example, a sheet of plexiglass would provide excellent cover, but horrible concealment.

"Concealment" - anything which hides a player.  It may offer no protection from incoming paintballs (like a shrub).

"Cover Fire" - firing that forces opponents to hide and not return fire so that a player can move.  Often abbreviated to "cover", as in, "COVER ME!".

"Pepper" - to shoot lots of paintballs at someone.  Usage: "Pepper the guy behind the left hand bunker!".

"Hose" or "Hosing" - to shoot LOTS and LOTS of paintballs at someone.  Usage:  "HOSE HIM!" or "I'm getting hosed!".  A person who is known for hosing is, of course, a "hoser".

"Light Up" or "Lit Up" - Lighting someone up means to hose them.  The victim of this refers to himself as being "Lit Up".  Basically, getting shot by lots and lots of paintballs.

"Dump" - same as hosing.  Usage:  "Dump some paint on that guy!".  Can also refer to the situation when a player tries to refill their hopper, but misses.  Usage:  "I dumped about 100 rounds on the ground back there!".

"Max" or "Max Out" - to achieve a perfect score in a game.  This is achieved by eliminating all the opposing players without losing any of your own teammates, and pulling and hanging the flag before time runs out.

"Pump" - a type of paintball marker that needs to be cocked, or "pumped", every time you take a shot.  Basically works like a pump shotgun.

"Stockgun" - a type of pumpgun that is operated by a single 12-gram CO2 cartridge (as opposed to a CA Tank), and must be rocked either forward or backward to get a paintball to load.

"Semi" or "Semi-auto" - a paintball marker which fires one shot for every pull of the trigger, and does not need to be manually re-cocked between shots.

"Turbo" - a paintball marker that shoots a specific number of shots for a specific number of trigger pulls.  For example, shooting 3 balls for every 2 pulls of the trigger, or shooting 2 balls for every 1 pull of the trigger.

"Electro-pnuematic", "Electro", or "Electronic" - a gun which is not controlled by a series of levers and springs, but micro switches and solenoid valves.  These guns typically have a very fast rate of fire.

"Paintcheck" - a Paintcheck is a check by someone other than the player to make sure a paintball that hit him broke, and wasn't a bouncer.

"Constant Air Tank" - a cylinder which holds the propellant for the paintballs.  Usually abbreviated "CA Tank", and is often referred to as a "Bottle".

"Chronograph", "Chrono", or "Chrony" - a device which measures the speed of a paintball, or the process of checking the speed of paintballs.  Usage:  "Go to the chrony and chrono in".

"FPS" - Feet Per Second.  How the velocity of paintballs is measured.  The maximum safe FPS for a paintball marker is 300 fps.

"Shooting Hot" - a marker that is shooting the paintballs at a higher velocity than is allowed.

"Barrel Plug" - a safety device which is inserted into the end of the barrel and prevents paintballs from exiting the barrel.

"Hopper" or "Feeder" - the device which hold the paintballs, and is located on the top of the marker.

"Guppy", "Pod", or "Speed Loader" - a long tube with a removable top which players use to carry extra paint onto the field in.  They are carried on a harness, or "pack".

"Up" - to be back in the game after cleaning the splooge out of your barrel.  Usage:  "I'm up!".

"Seam" - an opening in the opponents' defenses.

"Dialer" - a device which is used to change the velocity on many pumpguns.

"Elimination" - to either hit an opponent and "eliminate" him from the game, or a type of game where the object is not to capture the flag, but to "eliminate" all the opposing players.

"'Mag" - slang for several types of AirGun Designs Automag series of markers.

"'Cocker" - slang for several types of wOrrGames Products Autococker series of markers.

"Rev", "Revvie", "Revolution" or "VL2000" - a type of loader which has battery- powered paddles inside of it which rotate and insure paintballs feed into the marker without jamming.

"Chop a Ball" - to have a paintball which only half feeds into the marker, and gets sheared, or "chopped", in half by the bolt.  The result is splooge in the gun.

"Hopperball" - a game where the amount of paintballs a player can shoot is limited to the amount in his hopper at the start of the game.

"Tricked Out" or "Pimped Out" - a paintball marker that has lots of after- market parts and modifications.

"Air Up" - to refill your CA Tank.

"Gas Up" - to turn the air on, activating the marker.

"ASA" - Air Source Adapter.  The thing that your tank screws into.

"Back Bottle" - the type of set up where the ASA is located at the rear of the marker, and the CA Tank screws in horizontally, allowing it to be used like a stock.  If it is "Back Bottle", it means the ASA is located at the bottom of the handle, and there is a hose which connects the ASA with the air chamber in the front of the marker.  If the marker is "Rear Bottle", then the ASA is at the back of the marker body, rather than on the bottom of the grip handle.

"Vertical Bottle" - the type of set-up where the ASA is located at the front of the the marker, and the CA Tank screws in vertically.

"Liquid" - having liquid CO2 entering the valve of the marker.  Usually results in a marker shooting "snow".  Usage:  "I'm running liquid".

"APG" - Action Pursuit Games.  The leading paintball magazine.

"Rec Ball" - recreational games.

"Tourney Play" - tournament paintball.

"Power Feed" - the type of system where the hopper attaches to a tube which runs diagonally across the top of the marker.  It is supposed to feed faster than a "Direct Feed" (a system where the paintballs feed directly into the side of the marker), as well as prevent chopped balls.

"Vertical Feed" - the type of system where paintballs are fed into the marker from a hopper which is directly atop the marker, as opposed to feeding into the side of the marker at an angle.

"Elbow" - the piece of plastic that connects the hopper to the marker.

"Wiping" - cheating by wiping a broken ball and paint from your body or gear.

"Porting" - holes.  A barrel which is "ported" has holes drilled in it.

"Warp Feed" - the newest thing in Paintball.  The Warp Feed is a positive feed device which attatched to the bottom of your powerfeed (replaces the on-off plug).  With the Warp Feed, the balls no longer rely on gravity to enter the chamber - the Warp Feed actually PUSHES them into the chamber.  These are often used in conjunction with the new ViewLoader "Evolution" (or "Eggolution" as it has become known, due to it's egg-like shape) hopper.  Unlike the old ViewLoader 2000 Revolutions, the Evolution does not have paddles which spin to agitate the paintballs, but has a wheel which spins in the neck and forces paintballs into either the marker or the Warp Feed.  With a Warp Feed & Evolution combination, paintballs can be fed at much greater rates than mere gravity can accomplish.  Also, as these are positive feed devices, the marker will continue to load paintballs regardless of its angle (even upside down!).  Unfortunately, when your batteries run down, your feed rate slowly drops, and when your batteries are dead, your marker will no longer feed at all.  In the old Revolutions, when your batteries dies, it still at least worked like a standard hopper.