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Someone with absolutely no glute development or "ass." people who suffer from flat-crack are incapable of defacting without pain. Hank hill is the most popular public figure known to suffer from the disorder. Pants are constantly falling down on these people, causing general discomfort in those im the proximity of sufferers. Common actions like wiping the buttocks is not a simple procedure for those with flat-crack.
Person A: "hey, have you seen Kevin?"
Person B: "yea i saw that flat-cracked motherfucker earlier walking around the bar inciting perturbation in fellow patrons and staff."
Person A: "yea, typical Kevin..."
by muncleowns August 05, 2016
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