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reg grundies
Underwear; rhyming slang for men's underwear: Did you pack some reg grundies?
Contributor's comments: It does refer to your undies and it is rhyming slang, but I sort of remember it also being linked to Reg Grundy, the Australian game show producer.
Contributor's comments: Reg Grundy was a famous TV producer from the 80s, producing shows like Neighbours. Grundy Worldwide produces Wheel of fortune too.