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When a prism claps their knees when they walk.
James Horton is a knee-clapper when walking the halls of Cranston West
by MclovinDATa$$ May 30, 2018
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A rash looking STD you get when rubbing a mans penis inside the bend of someones knee.
1. Did you hear Joe gave Jamie the knee clapper on the church trip

2. My parents are going to kill me if they find out I have the knee clapper
by 2 girls half a brain September 26, 2013
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