knuckle sandwich 

To punch someone in the mouth to shut them up.

Tom: you're just jelous of me cuz I slept with your girl and you didn't. And y'know what? she liked it so much that I...
Edd: IF YOU DON'T SHUT UP, I'LL GIVE YOU A KNUCKLE SANDWICH

knuckle sandwich by LesleyDianna April 30, 2012

Knuckle Up

To prepare to kick another's ass, getting prepared to engage in fisticuffs

If you get up in my grille, you best knuckle up, motherfucker

Knuckle Up by stefanali pops September 26, 2005

Knuckle-head McSpazatron 

A Knuckle-head McSpazatron is a very, very silly person. Is used as an insult.

First use was recorded in the SpongeBob SquarePants movie.

'You're a Knuckle-head McSpazatron!'

Knuckle-head McSpazatron by RowHoe May 22, 2008

Knuckle Dunk

Whereas your hand is the basketball and her hole of choice is the hoop

Chris: What's Knuckle Dunk
Peter: Never mind what your friend said, if you wanna have fun with your girl try dancing

Knuckle Dunk by inglorious pseudonyms June 2, 2018

knuckle babies 

The man custard that shoots from the penis when rubbing one out.

"That chick is so hot, when I get home I'm gonna pop off some knuckle babies. When doing so, she will tell me I am great, and I will believe her."

knuckle babies by tommyboy79 April 24, 2006

knuckle tap 

Commonly referred to as dap, a fist on fist greeting traditionally given as a sign of respect. However, "knuckle tap" is most often used amongst Caucasians.

Daniel: "I played a superb match of polo the other day, and I received several knuckle taps!"

knuckle tap by Satch, MD November 26, 2007

Knuckle the Walnut 

To massage the prostate with your knuckles or fingers, especially in a strong manner, to induce immediate ejaculation.

Ever had a girl knuckle the walnut?! You'll shoot your load with the quickness!

Knuckle the Walnut by PDDestro December 8, 2009