Fudge knuckle 

When you put your finger up a butt during sex/foreplay, and you go a little too deep, resulting in a bit of poo on your knuckle.

Dude1: how'd it go with that chick last night?
Dude2: not bad. She wanted me to finger blast her butthole, so I did, but I got a little over zealous and ended up with a fudge knuckle.
Dude1: oh man. that's fucked up!
Dude2: yeah, but she ended up riding me all night so....

Fudge knuckle by Huge hammer69 June 25, 2021

gooch knuckle 

A move which consists of wrestlers sticking their fingers up peoples butts to win their matches.

Wrestler A: I’m so glad I won.

Coach: How did you end up winning?

Wrestler A: I used the gooch knuckle and he completely gave up.

gooch knuckle by amnbitch July 18, 2021

Squid Knuckle 

Anus. Butthole.

Nikki begged me to stick my tongue in her squid knuckle.

Squid Knuckle by DanaFX October 31, 2021

P-knuckle 

An old man with tight pants and his budget showing...cousin to moose knuckle

Old man Fred's P-knuckle is showing

P-knuckle by Twackerisms March 8, 2022

double-knuckle-shuffle

The double-knuckle-shuffle is a masturbation technique only known by the greatest baiters.

hey do you know the double-knuckle-shuffle?
the double-knuckle-shuffle is learned not taught.

double-knuckle-shuffle by (|-|4c| September 22, 2023

Whammy Moose Knuckle 

To forcefully punch a female in the vagina with your middle knuckle raised as if you are giving a half middle finger.

After that whammy moose knuckle she couldn't sit for a week!!

Whammy Moose Knuckle by RaTeDr21 February 11, 2010

Drop a knuckle 

When one performs fellatio and inserts a finger up their ass to enhance or spur an orgasam

Drop a knuckle when going down on your girlfriend just before she cums, she will love it!

Drop a knuckle by DonnyKidd March 7, 2015