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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
Related Words

grunkle stan 

I'm grunkle Stan and you're watching Disney Channel. XD
grunkle stan by soppu chan June 18, 2017
It is your great uncle but you are just too lazy to say the whole thing
Is that your grunkle peww he stinks of wee
Grunkle by doctordoo November 6, 2007

Grunkledy 

Noun. The male head of a hillbilly clan. Since the family tree usually resembles a tumbleweed, he's 'grandpaw' to some of the young'uns, 'uncle' to others, and 'daddy' to others.

Grandpaw/Uncle/Daddy; in short: Grunkledy.
"Het up off'n yore sister, Billy-Joe-Jim-Bo-Bob! Y'ol' Grunkledy he's a-comin' this-a-way!
Grunkledy by Hellzapoppin' August 27, 2018

grundeller

A person who licks, tickles, or otherwise plays with another person's grundel
That girl is the best grundeller, she started with her tongue and it felt amazing
grundeller by PSK480 December 15, 2008

grunklepa 

The rarest of the inbred race. Grunklepas are a special combination of grandfather/uncle/brother/father lookalikes in a single family. It is often hard to distinguish between the members of a grunklepa family because of the many years of breeding within the same bloodlines. Grunklepas can mostly be found wandering aimlessley through the aisles of wal-mart, or at your local wireless phone store complaining about their incredibly damaged phone not receiving calls correctly.
Look at those grunklepas. It's like "The Hills Have Eyes" all over again.
grunklepa by ydavevr4 February 7, 2010