Green’s Dictionary of Slang

gangsta adj.

[gangsta n. (1)]

1. (US black) used to describe the hedonist, violent lifestyle as epitomized in the lyrics of ‘gangsta’ rappers.

[US]Source Oct. 220: For more gangsta shit with a message, peep ‘Eazy 2 Get In’.
[UK]Observer 10 Mar. 13: I’m not in no gangsta warfare with no one.
[US]‘Touré’ Portable Promised Land (ms.) 157: We Words (My Favorite Things) [...] That’s real. That’s nervous. That’s gangsta. That’s hype.
[UK]L. Theroux Call of the Weird (2006) 200: Do you ever worry it could be too gangsta?
[US]Simon & Burns ‘–30–’ Wire ser. 5 ep. 10 [TV script] The truth is, I’m done with this gangsta shit. I’ve been there and done that.
[UK]Guardian G2 2 Apr. 2/3: She was gangsta with her clothes.

2. implying the defying of rules.

[US]G. Hayward Corruption Officer [ebk] cap. 17: Keeping it gangsta and coming down to the staff kitchen to meet me, leaving their inmates unguarded and handing me the keys to my post.