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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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Aug 11 Word of the Day
You can tell by the way she walks, she got that WAP.

You can look at her face and tell she ain't got that WAP.
by Black Don August 06, 2020
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