Ass Knuckles 

When a woman (sometimes a man) wears short shorts and the bottom part of her buttcheeks are showing. Mainly the part where the cheek meets the leg.

"Wow check out melissa in those short shorts you can totally see her ass knuckles!"

Ass Knuckles by Sleekfrog707 November 29, 2023

ass knuckle 

The growth of an inflammed, festered, and bloody hemorrhoid that creates a groove-like affect in your feces.

Dave, don't do it. Jeff has an ass knuckle, that's not going to be fun.

ass knuckle by Sean Piner October 1, 2006

Ass-knuckle

Someone who is clueless or stupid.

"Dude the new guy is such a dumbass!

"for real, he's a total friggin' ass-knuckle!

Ass-knuckle by Skin bone June 21, 2011

Knuckle-Ass 

The condition of having an asshole itch so intense and deep that it feels like the only way you can properly scratch it is to stick your finger up your ass all the way up to the knuckle, and scratch your asshole from the inside.

A case of knuckle ass might be the result of poor hygiene (see hanus anus) or could just be an unlucky ass itch that anyone can get from time to time.

"I took a shit this morning and I guess I didn't wipe well enough. Now I've got major knuckle-Ass"

Knuckle-Ass by smrtpntz November 12, 2011

Knuckle to ass 

When you make a fist with your hand and u rub the knuckles on the frame of an asswhole or in the ass.

Yo that guy be doing "knuckle to ass"

Knuckle to ass by Uk36yeahaight March 2, 2019

Brother Assknuckle 

Brother Assknuckle is a term used for someone who is a fraternity member or has intentions of becoming a fraternity member and is a total dipshit.

Hey Brother Assknuckle! Fuck you!

Brother Assknuckle by berrymmm November 16, 2010