A term used to describe a male that has no prospects in life whatsoever. A man who drifts through life aimlessly without any goals in mind. See: Scrub
Popularized by John Singleton's movie of the same name, which featured Snoop Dogg
Some characteristics (but not limited to) are:
1) Still lives with his mama,
2) Has no job/money,
3) Has a kid (or children) from more than one girl.