Top Definition
A group of slightly overweight individuals. Cute mofos. Guys don't want to party with them because they always get all the girls. No girl can resist a fatisoy.

The word FATisoy is derived from the words Fat and Tisoy. Fat because, well, they're so damn cute. Tisoy is a word with many definitions, but in this circumstance, is used as a word pertaining to a person that is awesome.
OMG a member of fatisoys! He's sooo cute! I WANT HIM! I WANT TO HAVE HIS BABIES! OMFG OMG OMG OMG!
by bitchimmamofo October 29, 2012

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