Top Definition
Men's briefs. Derived from "Reg Grundies" - Australian slang for undies or underwear - and from the concept of storing your berries (testicles).

Also known as sluggos, or budgie smugglers.
These grundaberries are too tight. I hope it doesn't affect my sperm count.
by Honeycut February 06, 2009

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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