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Grundles 

Underpants, Underwear, be it Boxers, Briefs, Thongs, high rise, low rise, cotton, rayon, or polyester.

Grundles is actually short for grundlemires, as panties is short for underpants.
If you cut somebody off in traffic and they start flipping you off or shouting obscenities, simply say "Hey, don't get your grundles in a bundle, pal."
Grundles by Sara B Ellum December 22, 2010

grundles 

grundles or grundle shavings are commonly used for the word/s pubes or pubic hair
Eww his grundles were seeping out of his shorts.
grundles by o milinhos July 5, 2008

Grungie Grundles 

Grungie Grundles smell really bad.

Ewwwwwwww look hes got on Grungie Grundles!!
Dang baby your Grungie Grundles are a major turn off.

Grungie Grundles 

Dirty Underpants, Soiled Underwear, be it Boxers, Briefs, Thongs, high rise, low rise, cotton, rayon, or polyester, bras, braziers, over the shoulder boulder holders, double barrel slingshots.

Grungy Grundles is actually short for filthy grundlemires, as panties is short for underpants.
Get your Grungie Grundles off the bathroom floor.

grundle fish

The act of diving head first into the groinular area looking for some fresh, salty grundle.
Gian grundle fishes like a truffle pig looking for black gold.
grundle fish by j$.devops October 5, 2010
Grundle is another word for chad: the region between the balls and the arse-hole; can be an erogenous zone for some.

Girl: I was fingering that part between his balls and his arse and there was shit there.
Everyone listening remained silent but later laughed among themselves:
'Eww! He had a shitty chad.'

When you measure your dick, you don't start at the arse-hole and include the chad; you risk getting shit on your measuring tape.
Q: What on earth is a grundle?
A: You know, the chad, the part between balls and arse.
grundle by Chane. March 27, 2020