Green’s Dictionary of Slang

gangbanger n.

[gangbang v.]

1. one who particpates in a gang-rape.

[US]G. Legman Rationale of the Dirty Joke (1972) I 267: The hippie gang-bangers do not give a damn.

2. (US black) a member of a teenage gang, thus attrib.

[US] (ref. to 1950s) ‘Cupid’s Story’ in R.L. Keiser Vice Lords 77: Out south, out north, or out west there’s a whole lot of gangbangers wherever you go.
[US]J. Maryland ‘Shoe-shine on 63rd’ in Kochman Rappin’ and Stylin’ Out 211: [He] was popular among the ‘young gangbangers’ (teenage gang members).
[US]E. Folb Runnin’ Down Some Lines 15: They are ‘homeboys’, ‘gang-bangers’, ‘stone foxes’, ‘chickenheads’.
[US]R.C. Cruz Straight Outta Compton 76: The Black gangbanger standing up in Billy’s face looked confused.
[US]N. Kelley ‘The Code’ in Brooklyn Noir 175: A former Cali gang-banger.
[US]Simon & Zorzi ‘Unconfirmed Reports’ Wire ser. 5 ep. 2 [TV script] I don’t need you [...] gangbanger.
[US]A. Steinberg Running the Books 4: Gun-toting gangbangers and coke dealers.
[US]T. Robinson Hard Bounce [ebook] ‘Looks like it could be a biker tat. Not any gangbanger shit I’ve ever seen’.
[US]D. Winslow The Force [ebook] The gangbangers are on the corners and the hip-hop bass hurts your ears.
[US]Rayman & Blau Riker’s 210: He was a really bad guy—homicide charges, a gangbanger.

3. (US prison) a member of an aggressive prison gang.

[US]Maledicta V:1+2 (Summer + Winter) 265: He’s wary of […] the gang-bangers, gang members who enjoy a rousing fight.
[US]T. Pluck Bad Boy Boogie [ebook] [T]he white power gangs eyed the new fish [...] and paid gangbanger wolves to put the scare into them.