Australian and New Zealand slang for underpants — the underwear you're wearing under your 'daks' (trousers). While 'daks' is itself Aussie slang for pants or trousers, 'underdaks' logically extends this to mean the garment underneath them. It's unpretentious, cheerful, and quintessentially antipodean — exactly the kind of word that makes Australian English so much fun. Used freely in casual conversation and carries zero embarrassment factor.
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Aussie and Kiwi vocabulary — bogan, daggy, brekkie, sheila, bach, jandals — the whole Antipodean lexicon, including outback dialect, surf and beach culture, and Sydney/Melbourne street slang.
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He'd been so rushed that morning he almost forgot to change his underdaks before heading to the gym.
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(Australian, New Zealand, informal) underpants.
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