Top Definition
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.
#pig #messy #fat #boy #phat #boi #clean
by karly;; May 28, 2008
7 Words related to fat boy stain
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