grundies
(Australia, New Zealand, UK, slang) Underpants.
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#1·Apr 27, 2026
(Australia, New Zealand, UK, slang) Underpants.
So I shrugged and shifted like my grundies were too tight.
Origin: * As Grundies, an underwear brand name. * Possibly an abbreviated form of Reg Grundies, rhyming slang for undies, after media magnate Reg Grundy. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
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