Green’s Dictionary of Slang

willing to indulge in multiple sex.

1969		J. Crumley One to Count Cadence (1987) 141: The local punches, gang-bang Southern belles.
1979		Lette & Carey Puberty Blues 35: She wasn’t a gang-bang moll, though. The boys liked her and she didn’t root for nothing.
1993		M.B. ‘Chopper’ Read How to Shoot Friends 117: I’ve seen a truckload of so-called strippers, most of them gang bang toss-ups pretending to be Gypsy Rose Lee.
2006		F.X. Toole Pound for Pound 77: This fucking gangbanger whore beaner.