Green’s Dictionary of Slang

(Aus.) a lavatory.

1967		‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxii 7/1: brasco: Toilet. A play on words, ‘where the brass nobs go.’.
1972		Parramatta Jail Gloss. B. Moore (ed.) (2023) 64: Brasco shithouse.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 18: Brasco Brasco (toilet).
1984		B. Ellem Doing Time 187: brasko: toilet, lavatory.
1986		R.G. Barrett Real Thing 14: What about an exploding toilet seat in the brascoe?
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Biscoe. Lavatory. Variation of ‘brascoe’. [Ibid.] Brascoe. Lavatory.
1996		J. Byrell Lairs, Urgers & Coat-Tuggers 287: But before they get there Thel has to spend a penny and gets Ken to hang on a mo just up from the ladies’ brasco.
2005		M.B. ‘Chopper’ Read Chopper 4 271: I get up and flush the lot down the brasco.