Green’s Dictionary of Slang

1. (Aus. und.) to divide up criminal spoils.

1895		Crowe Aus. Sl. Dict. 17: Chopped Up, stolen goods separated so as to escape suspicion.
1923		Smith’s Wkly (Sydney) 11 Aug. 15/4: [We] chopped up £14 each and 16/- in smash.
2014		S.A. Cosby ‘Grandpa’s Place’ in ThugLit Sept. [ebook] ‘We hit the [armoured] car, we chop up the money in the barn’.

2. (Aus.) to subject to group sex, whether voluntary or as gang-rape.

1999

R.G. Barrett Wind & Monkey (2013) [ebook] [T]he word was she got chopped up by a young swimming team at an Adelaide university, and she’d been dirty on men in general since.