Taking a dump on a toilet lid, then lifting up the lid as fast as possible to catapult the shit through the air and around the bathroom.
Dude that Chinese ninja took a shatapult in the downstairs bathroom last week, there was shit all over the place.
by Stebe Retfield February 03, 2006
This is when you are ice skating nude and you hit a perfect triple axle. Either while jumping up or during the post-landing spin, you pinch one off. The centrifugal force on your turd pulls it flying out at a force to be reckoned with.
I will shatapult on you.
by BigLud July 20, 2014