A foul party prank in which one turns on someone's oven (to preheat it) then sneaks a cookie sheet into the bathroom. A tasty dump is then taken on the cookie sheet and when the coast is clear the sheet is placed in the already warm oven. The culprit then usually leaves the gathering as it only takes about five minutes for the entire place to reek of dung. A horrible mess to clean up as well.
"You go to Mary's party last night?"
"Yeah, it sucked. I left her a nice soft batch though."