Green’s Dictionary of Slang

(S.Afr. black) money.

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: Magageba – money.
1979		A. Brink Dry White Season 84: ‘You’re their bank when they need some magageba’ – rubbing his fingers together.