Gangsta:
A sociopathic member of the inner-city underclass, known primarily for being antisocial and uneducated. Also known for ready access to illegal drugs and weapons, and staggeringly poor marksmanship.
"Yo, this gangsta loses his cheeba out his jeans, an' he thinks somebody snatched it, so he tries to cap my holmes wit a 9 and miss all 10 rounds. Killed two girls in tha' playground, though - that nigga be gang-sta as ****, yo."

or

Gangsta: an adjective used to describe something favorable in the context of urban culture.