when someone (preferbly female) bends their knee forming a crease between the thigh and calf, the penis is then inserted inside this crease. you then hump it rythmycally until a climax is reached
she was too tired for me to fuck her normally so i knee fucked her, damn it was so good
by gangsta ass pepsi hater May 10, 2004
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another form of knee fucking is if you lay down and put your knees together as if you were doing a curl, the penis is inserted at the top of the crease or where the knee is located and also rythmically pounded until the load has been excreted
we had 2 different types of knee sex damn im telling you that girl knows how to use what shes working with
by gangstaasspepsihater September 4, 2004
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When you're sitting on a stool at a crowded bar and people pass by you and your knee ends up either in their crotch or ass.
1: Yo I just knee fucked that chick with the big ass. She was wearing a fucking thong too.
2: Aw shit man, I just keep knee fucking guys...in the scrote.
by Fo Sheezy My Yeezy Breezy August 14, 2011
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To Continually Bring Your Knee To A Poser's,Douche's Or Anybody You Hate's Chest Causing Great Pain
I Got Tired Of That Fuckin Poser So Me And My Boys Knee-Fucked Him In The Chest Till We Got Tired
by Dragonboy007 April 14, 2007
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Damn girl, your kankles are turning me on. I'm gonna knee-pit fuck you, you skanky whore.
by bike shop August 15, 2007
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This is when a girl is getting fucked up the ass so hard that both her and the person fucking her knees buckle from the forces of fucking and getting fucked. Best observed in any porno where anal poundings are involved.
Dude me and my girl were fucking, it was Knee Buckling Butt Fucking night, she was so tired after that she fell asleep with my cock in her ass, what a night!

Knee Buckling Ass Fucking is the way to go
by Overloard October 9, 2010
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The saying you say after someone fucks your knees.
"MY FUCKING KNEES"
by RIFNJCldcnka zxc November 2, 2022
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