Is “undies” an Australian word? - Quora
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Answer (1 of 3): “undies” is a word that is in common usage in Australia, but others will have to say whether it is a uniquely Australian word or not. Before the turn of the century “grundies” or “Reg Grundies” was quite a common word in the Aussie vernacular. Possibly because of the obvious “und
History of the bikini - Wikipedia
Is “undies” an Australian word? - Quora