Scrub

A guy who mooches off of everyone else and has nothing going for him in life. Probably still lives with his mama, doesn't have a car, a job, or a plan.

A guy that can't get no love from neither T-Boz, Left Eye (R.I.P.) nor Chilli, who hangs out on the passenger side of his best friend's ride and attempts to get the attention of the aforementioned females but fails.

A scrub is a more derogatory form of the slang "noob", "nub" etc. and is primarily used in video games, particularly those which are multiplayer based.

Whilst a noob is generally considered one who is new to the game, and as a result not proficient, a scrub need not necessarily be new. It may imply that the person accused is forever a noob, regardless of how much they may practice.

A guy that thinks he's fly and is also known as a busta

A beginner, or a person who is clueless.

Someone who is below your level.

A shrimp-like loser.