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1.
the flapping together of the buttocks cheeks when gas is being passed
When Sam went flabbergasting, he accidently stretched out the pair of pants his friend let him borrow.
by sam loves men July 07, 2005
 
2.
butt cheeks flapping when gas is passed
joan flabbergasted so much that the people at the party could see her cheeks clapping together through her spandex
by unknown July 26, 2004