A person, usually referred to while playing CoD, as being garbage at the game.
Also used when you can't think of any other words to discribe someone else but just a scrub.
> Him: OMG i just got a Harrier
> Them: STFU scrub that takes no skill
> Him: Mommy they called me a scrub!
> Them: ....
> Random guy: SCRUB!
> Him: =(