Top Definition
Similar to cleft lip, flapped ass is a chronic condition in which either of the two glutei maximi (buttcheeks) recedes to form a significant gap, aside from the gluteal cleft (buttcrack).
1. "1 in 3 children have been diagnosed with flapped ass. For 15 cents you can save a child's ability to sit in a non-tilted position."

2. "Yo why is my right butt cheek so much bigger than the other?"

by thatoneguywhosaysstuff February 23, 2011

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