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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.
via giphy
by Chane. March 27, 2020
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May 8 Word of the Day
1. Slight sins or offenses
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Peccadilloes shows rule.
by James Messina August 11, 2006
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2
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.
by Tasty time May 21, 2012
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3
A protuberous underside. Particularly on an adorable animal.
My cat has the wobbliest grundle.
by Abiy0y0 February 26, 2017
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5
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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