When you and a friend have sex with the same girl in the course of three years or 100 bangs, whichever comes first, you share a bond created by your penis in the girl. You are therefore penisiblings.
Bro 1: Dude, last night I got laid with that chick Tiffany
Bro 2: No way! We're penisiblings!
Bro 1: High five!
*The sound of this high five brings happiness to everyone in a 2 miles radius, and makes them say "Nice"*
Bro 2: No way! We're penisiblings!
Bro 1: High five!
*The sound of this high five brings happiness to everyone in a 2 miles radius, and makes them say "Nice"*
by Smöl March 6, 2020
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