Green’s Dictionary of Slang

mashonisa n.

[? Zulu mashonisa, a cause of one’s losing heavily]

(S.Afr. township) a money-lender.

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H. Rose-Innes Nice Times! 118: Even if there is no money to spend on a party there are lots of fly-by-night loan sharks called mashonisa. They lend money and hold the borrower’s bankcard.