ice-cream, adj. — Green’s Dictionary of Slang

ice-cream adj.

(US) perfect, as desired.

1991		D. Jenkins You Gotta Play Hurt 75: I nudged Boris. ‘If she hits this, it’s ice cream.’ ‘What means ice cream?’ ‘The gold,’ I said.
2000		G.V. Higgins At End of Day (2001) 87: Everything is fine there, absolutely ice cream.

ice cream parlour (n.)

1. a solitary confinment or punishment cell.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 92/1: ice cream parlour, the n. the solitary confinement punishment cell, the pound.

2. (N.Z. prison) a cell for at-risk or mentally unstable inmates.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 92/1: ice cream parlour, the n. 5 a cell for mentally unbalanced or 'at-risk' inmates.

3. (N.Z. prison) the sick bay.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 92/1: 6 the medical area of a prison, the sickbay.