Green’s Dictionary of Slang

(S.Afr.) cash.

1977		P.C. Venter Soweto 153: A stranger to the tsotsi’s dangerous world could save his throat if he has some knowedge of basic words and phrases: Kuzak – cash money.
1979		A. Brink Dry White Season 80: You want to feel a bit of kuzack in your arse pocket [...] then this is the life, man. Spot on.