noun
A member of a criminal or street gang.
A member of a professional criminal organization (in organized crime): a racketeer.
verb
To act like a gangster; to commit street crime or run a racket.
adjective
(African-American Vernacular, slang) Characteristic of a gangster; (especially) admirable and audacious.
(African-American Vernacular, slang, Internet slang) On friendly terms; cool.