A play on cork stopper. A type of poop that feels hard but is followed by a fast stream of diarrhea that was previously held in place.
"Dude I thought I had a no wiper on my hands, but it was a cork plopper and I ended up using half a roll."

"I could never squeeze out a Cleveland Steamer, I'm too scared it'll be a cork plopper and I'd drown someone."
by Chucklefck March 1, 2019
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