knee knocker

knee knocker is a large erect Penis that is above 8 inches

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

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Knee Knocker

When someone laughs and you slap your knee

That was a Knee Knocker

Knee knocker

A stunt preformed on a bike. More so a dirt bike.

Can you do a knee knocker on your bike?