In racquetball, when a ball that was going to be a killshot goes under the buttocks and hits a male player facing the front wall in the back of the testicles, resulting in a testicular motion very similar to the bells on top of a door when you enter a store. Imagine hearing "ding-a-ling-a-lingaling" One of the most painful experiences in sports.
by Augie September 7, 2003