Fat Stains 

The build up of body fluids between the ruffles of a persons fat that can cause stains in clothing.

Aww shit, that fuckers fat! yeah and look at them greasy Fat Stains!

Fat Stains by DeathAtTheParty November 21, 2010

Fat Stairs 

The heavy breathing you get from when you go up a flight of stairs

Damn those fat stairs

Fat Stairs by 23savage December 19, 2016

Fat kid Stain 

When you're eating (usually carelessly) and you spill food on your shirt. Best example is when you're eating chocolate ice cream and it drips on your white shirt (also when you spill a drink on your shirt/pants). Always is an embarrassing moment and you usually don't notice it until someone calls it out.

Cool guy: Dude, check out this really sick Abercrombie & Fitch white polo I just bought.

Friend: Nice! Hey you want some chocolate ice cream on a cone?

Cool guy: Shit yea I do!
(Spills as he eats then goes and chats it up with a hot chick)

Friend: Dude... fail... That's a gnarly Fat Kid Stain on your shirt!

Cool Guy: Dammit you delicious ice cream!

Fat kid Stain by Enlicensed one June 8, 2010

fat boy stain 

A stain on your shirt; commonly found after eating. makes you look like you eat like a pig.

girl: don't look at my shirt, I spilled soup on it at lunch.

guy: ohhh! you got a fat boy stain!!

girl: ahahahhahahahahahaa...no.

fat boy stain by karly;; May 29, 2008