Grundgle 

A blind bird.

That poor grundgle can’t see where it’s flying.

Grundgle by anonymous May 24, 2021

grundle fish

The act of diving head first into the groinular area looking for some fresh, salty grundle.

Gian grundle fishes like a truffle pig looking for black gold.

grundle fish by j$.devops October 5, 2010

grundle 

Grundle 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 grundle?
A: You know, the chad, the part between balls and arse.

grundle by Chane. March 27, 2020

Grundle 

the art of pulling down your pants and smashing your testicles and anus down on the head of a passed out human repeatedly.

Luke puked in the frying pan before passing out, so Nate gave him a grundle

Grundle by weiser May 2, 2005

Grundle 

A protuberous underside. Particularly on an adorable animal.

My cat has the wobbliest grundle.

Grundle by Abiy0y0 February 26, 2017

grundle grumble 

grundle grumble ( grundle grumbler, grundle grumbling )

1: When a young lady is pleasuring her partner by kissing or licking his grundle the scrotum will cover the womans mouth preventing intelligible speech.

2: Flatulence that is prevented from escaping up the butt crack that flows over the grundle impacting the scrotum making a distinctive rumbling sound. Grundle grumbles are particularly evident when seated on leather or vinyl seating surfaces or those cheesy fiberglass chairs in laundromats.

3. Mysterious sounds that emanate from the grundle.

1. Whats that honey? I can't hear what you saying you grundle grumbling bitch you.

2. Jesus Dave I heard that grundle grumble from here. Stop farting on my leather seats..no more fucking burritos for you.

3. What the fuck was that? Oh..a fucking grundle grumble. Sorry. Do you have any fabric softener?

grundle grumble by Global Feetus April 2, 2007

trundle grundle 

when two people simultaneously insert one of their big toes into the others butt hole

We decided to get pedicures after the trundle grundle fest this weekend.

trundle grundle by chismosa6969 February 5, 2010