Somebody who steals jokes from other people or comedians and tries to pass it off as their own, or a person who uses the same waste-of-breathe jokes that are not funny the first time around. If found out, label that person with what they really are. A 'Comvict'
Group Of Friends
Guy 1: Wow its such a hot day
Comvict: I know, im wearing a wifebeater but dont worry, the guns are on safety