When a person is disheveled, hungover or a hot mess.
Damm…. She’s being a total grundle
1. The hairy sector separating your bunghole from your dilly-dally.
2. A room in a house/apartment specifically for men to hang out at, also referred to as a "man cave".
After a long, hard day of working in the yard, I love to come inside and scratch my sweaty grundle.
Man 1: Dude we've got the Nintendo 64 all hooked up in the grundle! Come over!
Man 2: Cool, bro! I'll bring over some PBR and an extra controller!
the perineum, especially the male perineum
I tried to shave my grundle but I just ended up making it itch.
I was pressure washing my lawn when a wasp came right up to me and stung me right in my grundle.
The perineum on a human male. Located between the scrotum and anus. Aptly named after the hairyness of the Grendel monster from Beowulf and a young polishman's genitals. Originated in Jessup Maryland circa 1994.
"Mike has a super hairy grundle and his girlfriend Ann wouldnt go near it, so he dumped her"
Grundle Knuckle is when the taint is rubbed or massaged to cause a dude to cum
Bruce was getting an old fashioned HJ and Stacy wanted to speed things up and gave him the old Grundle Knuckle to help him cum more.