SP - Single Player
MP - Multiplayer
SK - Spawn kill, Spawn killer, Spawn killing (Don't know what SK is? Click here)
TK - Typekill (Killing while Typing), Team Kill (not possible...)
DTS - Dragon Tooth Sword
Bind - Pressing a key will initiate a certian command
CMD - Command
lol - Laugh out loud (Common usage with me :D)
btw - By the way
brb - Be right back (Used a lot)
wtf - What the F*ck?
fyi - For your information
RL - Real life
(word)* - * means it's a correction