When you take your dick, and put it in between the girls calve, and hamstring (where they meet when knee is bent) and proceed to screw it.
by Heno July 03, 2007
Get a knee-knocker mug for your daughter-in-law Sarah.
Him: Hey Check out my huge knee knocker
*Pulls down pants*
Her: Oh my its so big
knee knocker is a large erect Penis that is above 8 inches
*Pulls down pants*
Her: Oh my its so big
knee knocker is a large erect Penis that is above 8 inches
by YT- Landonb December 22, 2018
Get a knee knocker mug for your guy Julia.
by boingjoun June 13, 2019
Get a Knee Knocker mug for your dog Riley.
by xd Shau7er (shaun) January 19, 2021
Get a Knee knocker mug for your cousin Georges.
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