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Courtesy Knuckles 

When a male continuously strokes the clitoris of a female vagina with his knuckles, while at the same time he masturbates.
Last night Andrew and I had sex at the montage. As he pulled out he began to masturbate and give me courtesy knuckles. It was a blast!
Courtesy Knuckles by Mr. Legend February 24, 2011

Courtesy Knuckles 

When a male continuously strokes the clitoris of a female vagina with his knuckles, while at the same time he masturbates.
Last night me and my boyfriend had sex at the montage. As he pulled out he began to masturbate and give me courtesy knuckles. It was a blast!
Courtesy Knuckles by Mr.ALegend February 26, 2011

Taint Knuckler 

An act where at the peak of an orgasm, the initiator of the orgasm, uses the 2nd knuckle of the middle finger( of the hand of thier choice) to rub the taint of the other person (or sometimes thier own taint) in a counter-clockwise circle, thus increasing the pleasure sensation immeasurably !
I would have gotten rid of her years ago but... she is the best Taint Knuckler I know. I would have gone out with Maggie Q but with such small hands her Taint Knuckling would leave me wanting so much more!

Holy Fuck Knuckles 

When you see something so excessive, amazing, horrifying, fortuitous, or otherwise awesome, that you are bereft of any other words to say.
Scott: "That guy just walked out the flaming wreckage after a car accident!"
Bob: "Holy fuck knuckles! He is still walking!"
Holy Fuck Knuckles by pokettomonsuta November 20, 2017

Bruce knuckel 

The male version of moose knuckel or camel toe in a gay way.
"That dudes pants were so tight his Bruce knuckel was alarming".Robert Plant,Burt Reynolds
Bruce knuckel by Bacon Bumps August 1, 2009

Knucklehead 

A nickname associated with fans of the heavy metal band Five Finger Death Punch.
Judging by his 5FDP shirt, he must be a Knucklehead.
Knucklehead by Tank238 October 15, 2012