1. the act of thinking of an obese person in a sexual manner..

2. dirty filthy sexual fantasies of a really fat person
Chelsea was lying in bed alone having fatasies of softy....

Billy saw the girl of his fatasies while passing Lane bryant
by softzirra January 6, 2011
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(Noun) - An exceptionally large girl with an excessive amount of junk in her trunk that you realize you want to hide your bologna in her. Grab your spear and your galoshes, cause your goin whalin'!
1: DAAAYYYYAAAM THAT GIRL IS HUUUUGE.

2: I know, she's my fatasy.
by Leo Brown February 16, 2010
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A fat guy or girl's fake life they brag about online
Guy online: Oh yeah, my girlfriend has DDDs, we had a threesome with Megan Fox the other day.

Other guy online: Dude, you're like 400 pounds in real life, stop talking about your fatasy
by grisecerise November 5, 2010
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