Procrastinate is defined as: To put off doing something, especially out of habitual carelessness or laziness.
Procrastinators tend to wait until the last second to do something they dont want to. This includes schoolwork, actual work, and stuff in general that requires any thinking or physical power whatsoever. Once in a blue moon these slackers actually realize that it is smarter to get something done early so that more time can be spent either watching T.V. or simply sleeping.