Green’s Dictionary of Slang

cut adj.5

[? SE cut-off date]

(N.Z. prison) of a sentence, finished.

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 51/1: cut adj. (of a prison sentence) finished, completed: ‘How long have you got to go?’ ‘Oh, just about cut, bro.