Top Definition
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 03, 2004

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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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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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