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.
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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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.