When someone puts their mouth on a girl's butt hole with their nose in the girls vagina and the girl farts in the persons mouth so the air comes out the persons nose into the girls vagina turning her pussy lips into "nose flaps" and making it flutter like a butterfly.
Jon - "Did you get it in with sally last night?"
Bob - "Let's just say nature worked it's way backwards. I gave her a mad German butterfly before I slipped the caterpillar in."
by bigoldputtytanggettinpandabear February 26, 2011

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