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.
by Chane. January 17, 2021
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An undefined very large amount of something, often used in the computer industry.
There is a grundel of wires in that mess of a network closet.
by Anonymous August 04, 2003
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that little flap of skin between your cock and your ass that has too much hair and itches like fuck
by Jeremiah & Nathan November 21, 2003
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The space of epidermis constituting the area betwixt the anal opening and the scrotum of a male, although a female also has a significantly smaller area of equal definition(substituting vaginal crevice instead of scrotum, of course). See also The New Jersey.
I loved the face my girlfriend made as she tongued my grundel. The amount of pleasure was infinitely excellent.
by Santa Claus December 08, 2003
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A grundel in Boston is that Area on a guy between his Balls and his crack.

When it gets to hot and you've been walking a lot it may start to chafe, and then you have grundlitis.
My grundel is starting to chafe up on me.

I got some mad grundel cheeze brewing down there.
by dOEPain July 19, 2005
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