adj. The hair between a mans ball sack and anus. Often used as an insult.
John you are such a grundle
by matt c. November 03, 2004

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The area between the scrotum and anus
Lick my grundle
by Rob January 14, 2004

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the flat yet hairy surface between the scrotem and the anus--sometimes i become stinky from a physical activity.
moy grundle is so hairy that there are roaches living there
by grundle October 03, 2003

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The gap between the males anal opening and Penis.
I have a rash on my Grundle.
by Jill May 02, 2003

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The sweat under your balls, between your legs, and in your ass crack.
All this running is giving me some bad grundle.
by U23Dwas_awesome April 17, 2008

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A noun used to define the sticky build up found underneath the scrotum. Build up increases when the persons doesn't shower or has had hot sweaty day.
Person 1: Yo J-Kwon, take a wiff of this.
Person 2: Damn! What the hell is that on your fingers.
Person 1: I haven't showered in days, and that's some of my wicked bad grundle build up from my fat ball sack.
by Flo$$y B May 31, 2005

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the art of pulling down your pants and smashing your testicles and anus down on the head of a passed out human repeatedly.
Luke puked in the frying pan before passing out, so Nate gave him a grundle
by weiser May 02, 2005

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