A dried piece of dog shit that accumulates on near the ass of a dog. The shit flapper will open and close as the dog has to fart, or take an additional shit, much like the cover on the smokestack of a diesel truck.
I've got to cut the shit flapper off my dogs ass, it's starting to crumble onto the floor.
by Johnlange January 13, 2017
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noun. (an addition to "The Shit List")

The kind of shit that seems to create it's own weather system. While taking a shit, your butt cheeks feel like they are flapping in the wind when the shit comes out.
"Did you hear the big crack flapper shit I just had?"

"Yes, it sounded like you were ready for take off!"
by jamminspacey January 24, 2010
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