flapping ones penis in a rotating circle at a guy/girl while making noises like a helicopter
I'm going to do some penis flapping with my girl tonight!
by mr flappy flaps October 14, 2014
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A penis flap is the pouchy thing on your sweatshirt or backpack. Penis flaps enjoy being stroked and having sex. =)
My penis flap wants to rape a hairy beast!! :o
by Caitlin & Mandy March 20, 2005
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