cock knee Share definition Flag A move in Muay Thai involving a knee to the groin. Not to be confused with Cockney. It looks like Kanchana just performed a cock knee. He hit Pracha in the crotcha. I think he's gonna be down for a while. cock knee by thundercatsho! December 19, 2008 0 0 Get merch Get the cock knee mug. Buy Now — $32.95 See more merch