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The simultaneous occurance of every humanly imagineable bodily function (i.e. ejaculation, weeping, defecation, urination, hemorrhaging, perspiration, sneezing, coughing, drooling), resulting in both severe pain and unparalleled pleasure.
In loving memory of Jacob Anthony McCormick, who deceased this past Monday, December the 6th, 2005 from an unexcpected, fatal grundle. God rest his tormented soul and mutilated body.
The act of burrowing your nose into someones anus durring sexual playtime. A gluteal motor boat. Also known as a "Steam Boat Willy".
We started with the Dutch rudder, then moved on to the Dirty Sanchez, and ended with a lengthy and lively Grundle.
grundle by Tasty time October 29, 2012
A large quantity of something awesome, can also be used as a measurement of some thing awesome.
There are a grundle of tattoos on that man's foreskin.

That chip is going to make you car a grundle load faster.
grundle by bamf bromine April 24, 2011
The guitar picks stink of Dave's grundle and tiger balm!
grundle by Metal Maniac April 12, 2006
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!
grundle by Grundle Master 5000 February 16, 2009
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.
grundle by Flo$$y B June 6, 2005