Often used to describe a girl's big butt. Sometimes used in a pickup-line.
Damn!! that bitch got a fatty! Damn girl you got a fatty,let me holla at you right quick.
by Nick@Nite May 13, 2006

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1. Used to define, 2 or more fat people (usually women) waddling together.
Plural of fattie

2. The name given, when describing the horrific train ride you had today, when the person on either side of you, and possible in front of you, invade your personal space, and sat on your lap. They claim it is not intentional, but if you’re that fat, you should walk to work, and not allow your fattie legs to rest on me.
1.
Jim : Are we having an earthquake ?
Brad : No, there are just 5 fatties coming towards us.

2.
Peter : Hey man, what happened to you, you look kinda flat ?
Sam : I had these two fatties sitting next to me today, and they were so fat, they could not fit in their seat. So they hat to sit on me, with their fat legs.
Peter : Will you be ok ?
Sam : Yeah, I had to go through a decontamination.
by DrSnow April 19, 2005

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a person who loves food, not necessarily one who is fat
Bob: OMG I WANT FOOD.
Rob: fatty.
by whoadudethatsawes0me October 23, 2006

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A derogatory term used to describe overweight people
Look at that fatty over there she needs to lose weight
by Russo919 March 18, 2013

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Someone who is not fat, but eats a ton. They should be morbidly obese because of how much food they eat, but are somehow miraculously skinny.
Kojo eats a box of donuts after every meal. How is he not obese?! What a fatty.
by Kornelius Jonesworth February 18, 2013

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Another way to call someone fat or obese.
Shut up Fatty, and lose some weight!!!
by kojuhuyh August 12, 2012

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A fat ass cock
Yo did you see Kim Kardashian's tweet she said Kanye put his fatty in her ass
by Hotline Bling Drake November 27, 2015

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