Green’s Dictionary of Slang

(Aus.) a six-month prison sentence.

1882		Sydney Sl. Dict. 9/2: Black Bess lumbered Mother Shooter to the Nick yesterday. She got a dream for chovy bouncing. The prison van took Mother Shooter to Darlinghurst jail yesterday. She got six months for shoplifting.
2007		(con. 1890s) W. Ings ‘A Convenient Exchange’ in Public Space 3 2: It won’t be a dream, I reckon he’ll be up for a two stretch.