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Grundle (Aka-Trundle) being the area between your balls and your asshole.
Butter being...butter

Grundle Butter is greasy Sweat that gathers in the Grundle region, Semi-transparent in color with a refreshing odor.

SFM-Trundle Butter
"Why is Steves asshole wet?"

"Thats just his Grundle Butter."

"Poor Bastard"
by XPR November 30, 2004
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3
Noun: A greasy semi-transparent fluid which accumulates in the area between the asshole and ball sack (known as the grundle)

Verb: Spread or cover (something) with grundle butter
Noun: "Why does that napkin smell like shit?"
"It's got grundle butter on it"

Verb: "Budget rental trucks pissed me off so bad I grundle buttered their doorknob while they were closed"
by SurvivingMike May 31, 2011
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An unfortunate gelatinous sweaty buildup on the grundle (which is the hair and area between your genitals and arse-hole).

I pulled off my jock and found a pat of grundle butter on it.
by madmark65 October 28, 2003
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5
The left over cum on your dick and the cum that seeps back out of your partners twat after intercourse eventually mixing together and settling in your crotch.
I could have had a fish fry with all that grundle butter.
by Zac Hulsey January 06, 2006
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6
A build up of sweat and unwashed buttcrack that results in a sticky, buttery poo-paste that may stain underwear or make it difficult to wipe successfully.
"Oh man, I keep wiping but there's just so much grundle butter! Maybe it's time to see a doctor..."
by slipperysl_hoe_pe November 29, 2018
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