knuckle burn 

When you put one of your knuckles on a pussy and virgourously rub until the pussy and knuckle become raw.

Bro I can't believe Samantha took that knuckle burn so well, I still have 3rd degree burns on my knuckles.

knuckle burn by Penisgrasper69 August 4, 2017

Burnt Knuckle 

An extremely sore clitoris. Usually from too much bean flicking, relentless railing or aggressive oral.

Well with all the lockdowns I’ll be alone over thanksgiving watching porn and flicking the bean. I’m sure come Sunday I’ll have one burnt Knuckle.

That old butch lesbian sure can munch a box. She worked my slit for hours and left me with a sloppy burnt knuckle.

My little love box was unable to take his meat so the relentless pounding left me with a burnt knuckle.

Burnt Knuckle by Dick Onchin November 19, 2020

Burning Knuckle 

"Down, Down-Back, Back + Punch"

A burning knuckle is an attack found in the Fatal Fury and King of Fighter games, and is generally done by Terry Bogard. He first lifts his arms and yells "Burning Knuckle!" but can miss-interpreted for "BROWNIE" in some games, he then quickly dashes up to the opponent and delivers a hard punch.

Rock Howard, Terry's disciple, has his own rendition called Shining knuckles were he uses his shoulder instead of his fist.

A burning knuckle is great at getting to your opponent quickly, but watch out for low kicks and counters.

Burning Knuckle by Ravaged Jalapeno November 9, 2008