A P.B is a type of homosexual person also know as a pussy bumper. They bump pussies with other P.B girls and get pleasure from doing it. It can also be referred to as a action (like scissoring just with extra steps)
P.B.
1. acronym for Perv Boy or Pervert Boy
-a term you use on a sincere sweet man but you realize that he's also a closet horny, playful, naughty dude.
1. Aisha: "Aiyy Brian! You're bad, but I love you because you're my P.B.!"
Brian: "Yea, I know you like it! hehe because I'm you're P.B.! I love you, Aisha, you're my P.G.!"
(for the meaning of P.G., please look up P.G. in the urbandictionary).
2. Wabbit: "bBoy is a P.B.! Grrr, I love his belly.. He's hott!!!"
Beau:im gay
Denny:you name is now forever penis butt Corey:how about just P.B.
Denny:perfect,you are the smartest redneck,southern,republican,george bush worshiping,retard ive ever met