Green’s Dictionary of Slang

las n.

also laas
[colloq. Afk. las, to increase]

(S.Afr.) money, esp. as a loan or a contribution.

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[SA] informant in DSAE (1996).
[SA]F. Dike First South African 30: rooi: Yeerrrr Solly, you’ve cleaned us out. max: Well Solly my laitie, make ’n laas daar. solly: O.K. gents, let’s go and have a drink.
[SA]B. Simon ‘Outers’ Born in the RSA (1997) 43: He gave me a las the other day. He gave me two rand.
[SA] informant in DSAE (1996).