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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
belly boy by Magixboy August 7, 2018
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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
belly boy by Magixboy August 7, 2018

Billy Boy Swagger

Billy Boy Swagger is when you act better than others. People who have Billy boy swagger normally annoy others and act like they can't do anything wrong.
Guy 1 "Man, you seen Mike? He's got Billy Boy Swagger"
Guy 2 "Yeah, what a twat"
Billy Boy Swagger by Pidgeon man February 14, 2020

billy boy 

Slang for a condom in the song Willy Use a Billy Boy by E-rotic.
Oh Willy use a billy, don't be silly, oh sex is joy but use a billy boy.
billy boy by Phy February 13, 2005
A teenage boy who attends Bellarmine College Prep, is most likely good more than one sport, and if not is crazy smart. Bellarmine boys frequently hook up with girls known as presbians, but also steal the girls from other schools that suck, like St. Francis, Mitty, and whatever public school is nearest their house. Bellarmine boys are made fun of for going to an all boys school, but the haters of Bellarmine are jealous because they get so much poon.
Jessica: Oooh look at that hot guy over there
Jenny: He's a Bell boy..... go have sex with him
Jessica: OK! :D that would be fun!
bell boy by asthmaticrino555 June 11, 2011

bell-boy 

When both scrotum are inserted inside the vagina along with the penis. ie: 'bringing the bags in'. This can be done either with or without the help of the recipient of the bell-boy without effecting the name.
"I gave her a bell-boy!"

"Bullshit man."

"Nah straight dogg, this bitch had a bucket!"
bell-boy by Samnig November 22, 2006

Fascist Bully Boy 

Perhaps someone who is both a fascist and a bully. However, the word "bully" in this case is most likely intended to be exclusively paired up with the word "boy", making a word whose meaning may simply be a generic insult.

British in origin.
"The Bank is run by fascist bully boys!"
Fascist Bully Boy by Asura October 26, 2004