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1.
Verb,
To skillfully insult or put down someone.

It is often stated after the end of such a sentence in which you preform it. It can be used as an adjective, as with most verbs.
Jeff: "Tim, you're a very gangstafaced person."

Tim: "Yes, I know. And you you're a very tall person. Stop acting so obvious, you cat funt."

~~~~~~~~~~~~~

Tim: "Hey, Jeff! Your shoes are disgusting! Gangstaface!"

Jeff: *Sobs*
by K-Sizzle. December 06, 2009