The "clapper" is the little piece of metal that dangles inside a bell, causing it to make noise when it hits the sides. As such, when a female stands up after sex and wiggles her hips side to side, causing her outer vaginal lips to shake, it is called doing the clapper. (The female version of the helicopter).
After having sex with Carl, I always like to do the clapper to make sure he didn't cum inside me.
4👍 4👎