The noise made by butt cheeks flapping together as gas is expelled violently. This usually occurs after consuming several bean burritos, drinking a warm coke and jumping on a trampoline.
George sure is noisy today. He has a terrible case of flutterbutt
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The overwhelming feeling of dread caused by dropping your piece of toast and seeing it fall on the floor buttered-side-down
*Avraxia drops toast* "Did it...? GODS NO!! IT FELL BUTTER-SIDE-DOWN!!!"
*Silver hears racket* "Avarxia, are you all flutterbutter again??"
The fondling of one's butt crack in a rhythmic flute like manner, often in a joking situation, occasionally in a sensual one.
Sean wrestled Andrew down to the ground and gave him a flutterbutt
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