A fork of Rural Dictionary
n. sweat from the balls and ass crack that congeal in the taint area.
'man, it's so hot today... i have so much grundle butter'
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.
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.
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"
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"
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..."