Knee-clapper
When a prism claps their knees when they walk.
James Horton is a knee-clapper when walking the halls of Cranston West
Knee Clapper
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
2. My parents are going to kill me if they find out I have the knee clapper