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Grundel 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 grundel?
A: You know, the chad, the part between balls and arse.
grundel by Chane. January 17, 2021

Brandy Grindzz 

The classiest of all stoner chicks! A Brandy Grindzz is a pot smokers dream, both unique in style, charisma and rolls blunts like a true legend. All the other girls want to be a Brandy Grindzz and all the boys want to marry a Brandy Grindzz (including the fathers). She is always happy, smiling and smoking bud! Always positive, empowering and chilling out...
Brandon: Dam there go's another Brandy Grindzz.

Peter: If only I could find myself a Brandy Grindzz, my dream, my life, my love.

Brandon: You sentimental git!, but yeah we all need a Brandy Grindzz
Brandy Grindzz by CannabisKings March 28, 2019

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
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
Grundle by weiser May 2, 2005
A protuberous underside. Particularly on an adorable animal.
My cat has the wobbliest grundle.
Grundle by Abiy0y0 February 26, 2017