Green’s Dictionary of Slang

1. (Aus.) a prostitute; thus as v., to prostitute oneself.

1967		‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxiii 4/4: cracker: A prostitute [...] cracker joint: Brothel.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 22: Cracker Prostitute.
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Cracker. To prostitute one’s self.
1991		R.G. Barrett Between the Devlin 16: ‘[O]ld crackers full of hookworm and various forms of STDs’.
2005		M.B. ‘Chopper’ Read Chopper 4 106: Should you be unlucky enough to fall in love with a cracker then stab yourself in the back.

2. an attractive young woman; usu. as a little cracker; occas. a man.

1970		B. Naughton Alfie Darling 186: I definitely had to have a piece of cracker.
1977		S. Berkoff East in Decadence and Other Plays (1985) 68: I saw the most awful cracker. A right darlin’.
1980		J. McClure Spike Island (1981) 27: Don’t know what ’e’s resistin’ for; she’s a right little cracker, that one!
1982		J. Sullivan ‘Diamonds are for Heather’ Only Fools and Horses [TV script] Cor, he’s a little cracker ain’t he ah?
1986		R.G. Barrett Godson 373: ‘All the girls know me.’ ‘Yes [...] Every cracker from Macleay Street at the Cross down to the wall at Darlinghurst’.
1997		(con. 1960s) A. Frewin London Blues 94: Would I feel any different if the two girls over there were a couple of real crackers.
2001		K. Waterhouse Soho 69: Still good-looking, though, in fact a right cracker, considering she must be drawing her old-age pension.