Stands for phat black ass, it is usually used on hook up sites or people looking for a hook up.
Her profile said *P.B.A* and she wasn't lying her ass is huge.
A guy who likes to play with, show off,or grow his belly. It can be sexual and most times is,but not all the time. It can be used interchangeably with gainer.
Do you know why Zach stopped going to the gym, his getting fat
I heard his girlfriend is into belly boys
That explains why he let himself go
A belly boy is a guy who has a large belly and finds enjoyment in having it played with, showing it off, or wanting it to grow bigger gainer
Jonny has gotten pretty fat lately
He actually seems to enjoy having a belly
I think he might be turning into a belly boy