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Guy is required to insert penis between girls legs as she flaps them together violently, as it beats the hell out of the mans weiner, and by chance causinghim to sperm on her chesticles, and have her yell, "The Flapping Butterfly!"
I think i broke the tip of my weiner off, executing the flapping butterfly.
by poo inator February 01, 2006

Words related to the flapping butterfly

chode monger crx harcore penis violent