The butter that grows under your thighs after a hot monday morning.
Usually found on the fat female species with a high tolerance to cottage cheese thighs.
Dude, that chick had a shitload of grundle growing under your thighs!
by Grundle Master 5000 February 16, 2009
Another name for Heroin.
"I am picking up some grundle today."
by Sticckky April 24, 2007
noun: The sweat off your balls.
The guitar picks stink of Dave's grundle and tiger balm!
by Metal Maniac February 26, 2006
sweaty, stinky section between ball sack and rectum that girls tend to love to lick. the grundle was made famous my matt lantz.
mick kaywood plays with his grundle.
by mick March 16, 2005
Also known as a gooch, the grundle is the (usually smelly) region between a man's scrotum and anus. I don't know if the small area between a woman's vagina and anus counts as a grundle.
Do women have grundles? Find out more at 11:00pm.
by Adam Tr0n February 11, 2005
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."
by Sara B Ellum December 21, 2010
To have sex
"i'm gonna go and grundle that girl over there!"
by chipmonk1 March 30, 2009
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