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1.
GPB
The number of girls there is for one boy at a party.

Girls Per Boy.

When it's alot of girls and few boys the number of GPB increases.
Person 1 (guy): Where are you dude?

Person 2 (guy): I'm at a party!!
Person 1: Oh, is it worth coming?

Person 2: Hell yeah, it's 3 GPB!!
by Beverly Hille April 10, 2010
 
2.
gpb
Gamer Point Bitch. Someone who plays Xbox360 games solely to collect gamer points.
"Dude I hope you had fun playing Doritos Dash of Destruction, you fuckin' gpb"
by Frank Kosher January 14, 2010
 
3.
GPB
Granny Panty Bri.

Being able to see the panty style that a woman is wearing through their pants.
look at that Gpb bro
by theOnetheTwo March 21, 2014
 
4.
Gay psychiatry boy
What a G.P.B.!
by Word up October 16, 2003