Green’s Dictionary of Slang

1. (Aus.) a five-year prison sentence [the five fingers on a hand].

1968

J. Alard He who Shoots Last 123: I got a hand orf da beak; but I only got da clock ta do; I’ve got four down.

2. (S.Afr. drugs) a small measure of marijuana.

1991		J. & W. Branford Dict. S. Afr. Eng. (4th edn).
2006		F. Khumalo Bitches’ Brew 255: A dagga ‘hand’ retailed for R30 on the street.

3. (N.Z. drugs/prison) an ounce (of a drug).

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 84/1: hand n. an ounce.