Green’s Dictionary of Slang

kembla (grange) n.

[rhy. sl.; ult. Kembla Grange, an area of Wollongong, New South Wales]

(Aus.) small change.

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[Aus]R. Aven-Bray Ridgey-Didge Oz Jack Lang 33: Kembla Grange Small Change.
[Aus]G. Seal Lingo 90: Some other examples: [...] kembla grange change (money); mallee root for prostitute, a drollery on the slang term for sexual intercourse.
[Aus]Pete’s Aussie Sl. Home Page 🌐 Kembla Grange, Kembla: small change.