Green’s Dictionary of Slang

Darwin blonde n.

[proper name Darwin + SE blonde; the ref. is to the Aborigine population of Northern Territory, of which Darwin is the capital]

(Aus.) a mixed-race woman.

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O. Griffiths Darwin Drama 54: At Bagot Compound for Aborigines a big proportion of the inmates were half-caste girls, referred to as ‘Darwin blondes’ [AND].