Wind-slapper

A wind-slapper is a sexual act of when a man lays down on his back. A woman will be riding his cock in cow-girl position. The female partner will then proceed to release flatulence over the male counterparts scrotum, making the balls slap together inside the bag

"Ive been meaning to try out a new move. It's called a wind-slapper. Essentially you just need to fart on my balls, while you're riding my penis."