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One who is the fattest individual among his group of friends or peers. This individual often does not believe he is fat and will accuse others of being more fat then himself. Often has a skinny body but an enormous gut.
Dear God, have you seen 120, that guy is a FAT BOI. His pre-bed beers have really caught up with him. Disgusting.
Fat Boi by Fatso120 August 5, 2019
Related Words
Fat fat ass father Fatima fatherless Fatty Fatneek fat fuck fat-e fathead

Fat Boner Blaster 

When you jerk off so hard to something you really aren't supposed to jerk off too, but you bust a fat nut anyways.
Me: Doctor! Help! I jerked off to something i wasn't supposed to jerk off to!
Doctor: Uhhh, What did you watch?
Me: Bandicoot pornos.
Doctor: Im sorry to say but, your dick is becoming a fat boner blaster.
Fat Boner Blaster by SnakeBoiWasHere September 1, 2019

Fat Guy Mentality 

A mindset that is either incredibly self destructive or highly manipulative
Guy 1: Casey pretended he was homeless so a random guy in the street would buy him a frosty from Wendy's

Guy 2: Wow, that sounds like a serious case of Fat Guy Mentality, or FGM

fat legend 

someone who is fatter than a skinny legend, but not as fat as an obese legend.
Isaiah: Did you see how big Danica got?
Me: Fuck yeah she's a fat legend.

Isaiah: *eats 10 Alabama hot pockets like a fat ass*
Me: be careful Isaiah. You're a fat legend now but you're on your way to being an obese legend

Fat Howard 

A person who refuses to grind with anyone else but his sister at dances and doesn't let her acknowledge it's him even though it's not Alabama.
Did you see Riley pull a Fat Howard at the club last night.
Fat Howard by MrSuperSoaker November 8, 2019

Fat Boi Seven 

He is just super duper fat! He sucks. He has diabetes, cancer and lots of other diseases now, even he is just 11!
Fat Boi Seven is so fat he was fatter than Yo Mama.
Fat Boi Seven by U r Fat Mama Fat December 1, 2019