Poop cork
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.
poop cork
When one has anal sex with a person and a gob of shit plugs up the opening of the penis.
John Fucks Jill in the ass and afterward John finds his p-hole clogged with a poop cork
Cork Poop
When your first poop is a large, solid, and usually hard poop that you struggle to get out. Once you get it out and pop the cork, all the following poops are small, wet, and just flow out.
I thought I was done pooping and was going to make it to class on time. I was wrong. I had cork poop.