a fat, nasty woman who thinks she is just the sexiest thing on earth.
usually a fatty patty is the fat chick who wears booty shorts and belly shirts, you know, the ones you go 'EW PUT THOSE AWAY!' at.
Kelly: ew look over at that girl in the booty shorts!
Jake: what the hell, shes one ugly fatty patty!
Kelly: seriously, she needs to put that shit away! gross!
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