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underdaks

Australian and New Zealand slang for underpants — the underwear you're wearing under your 'daks' (trousers).

ˈʌndɚˌdækshistorical189 viewsLast reviewed Jun 29, 2026+ Add a definition
🇦🇺 Australian & NZ slang
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Australia
#1·Apr 28, 2026AUS

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.
Origin: Extension of Australian slang 'daks' (trousers), which derives from the British clothing brand Daks, popular in mid-20th century Australia. Adding the prefix 'under-' creates the logical compound for underwear. The word 'daks' itself has been Australian slang since the 1950s. Editorial expansion authored on Slangora.
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Australia
#2·Apr 27, 2026AUS

(Australian, New Zealand, informal) underpants.

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🇦🇺About Australian & NZ slang slang

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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