German butterfly 

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."

German butterfly by bigoldputtytanggettinpandabear March 13, 2011

German Butterfly Bounceback 

Picking up an 18-20 year old girl off the street and offering her several hundred dollars for a quick photoshoot. You will then take her back to your apartment where you have her get on her knees in a kiddie pool and put on a zorro mask (not the hat, mind you, just the mask). She will then proceed to pour bottle after bottle of brand name raspberry jelly on her head while 4 men (all named Hans) stand around the pool on matching wooden stools wearing Guy Fawkes (V for Vendetta) masks and pee on her head. Music is optional, but if it is used, it must be provided by either a live opera singer or a loud set of speakers playing "It wasn't me" by Shaggy (recommended). There have been whispers of a double dare method in which an additional man of hispanic descent is strapped to a chair in front of the pool with his eyelids held open Clockwork Orange style for the duration of the session but these are simply rumors as such a thing has never been attempted. Best performed while wearing Riddick style goggles.

Rick: Dude! check it out! I just put up this definition for the German Butterfly Bounceback on urbandictionary!
Steve: *reads* Dude...what the fuck is wrong with you?

German Butterfly Bounceback by Rick_Astley January 25, 2014