Green’s Dictionary of Slang

(S.Afr.) to let go, often as excl.

1983		Fair Lady 19 Oct. 48: There’s nothing like a whitey trying to be a blackie. You know, los uit [DSAE].
1986		P. Slabolepszy ‘Boo to the Moon’ in Mooi Street (1994) 120: Hey, los it, Spider.
1991		P. Slabolepszy Braait Laaities 15: boikie: I phone downstairs. There was no answer. moira: Well, then you must los them. It’s not happening.