When you have a bad stomach ache and torturous gas pains, so you go to the toilet to pass the gas. A small, hard turd pops out and goes "BOP!" and then all the gas passes at once, and you experience a rapid deflation of your colon.
Poop cork: Thank god I popped that "Poop cork" because the stomach pains were unbearable.
by bachmanitoven May 12, 2012