When knees lock up while one is dancing causing a jolting motion.
He really wanted to get down to the band but had a bad case of funky lock knee.
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
When someone works with homeless people and gets infested with fleas.
Hey do you want to hang out with Sarah this weekend? No, that girl is the fleas knees.
when her boobs are so big and saggy, they can be manipulated in a seated position by bouncing them off of her knees perhaps by her knees.
See that bitch sitting over there? I wish she would stop tapping her foot because her knee puppets are flopping around like a fish out of water.