Green’s Dictionary of Slang

blossom n.3

(Aus.) the female genital area [positive connotations, esp. child-bearing].

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[Aus]D. Niland Call Me When the Cross Turns Over (1958) 113: They’ve put honey on Chloe’s [a nude woman in a painting] blossom again. Look! Strike me fat, I could spit tacks.

In phrases

put a blossom on it (v.)

(Aus.) to sodomise.

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[Aus]‘No 35’ Argot in Simes DAUS.