The act of depositing excrement into ones own hand and slapping the hot steamy load on top of the head or your lover before, during or after sex.
Man: "God babe, you've totally got me so hot, I think I'm gonna' shit myself"
Woman: "Oh wait...do it in your hand!"
Man: (bowell noises) "What the fuck...this is nasty!" Smack!
Woman: "Oh Yes! My own hairy hairy winston!"