Woppie Slap

When someone fills there butt-hole with air and then someone slaps it and they let out a little poop.

Dan: what happened to you lastnight?
Jake: oh my god dude, Jane wanted to try this new thing called woppie slap. i didnt know what it was till it was already done.
Dan: I have heard about woopie slaps, thats disgusting dude.