To act, or actually be, stupid or dumb or ugly
Holy fuck, hannah is being such a fattie!
by gunnmeister October 31, 2021
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A girl wit a fat ass that looks good. Not no fat ass girl whose ass is the size of a geo metro. Imean a nice tight, fat ass that reminds you of an apple.
by Remix233 September 23, 2004
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1: One who eats far too much in one sitting and is aware of their habit, but continues to chow.

2: A talentless bass guitar player from the foothills of the Allegheny mountain region who uses lessons as an excuse to meet girls. Early member of the growing trend of "hardcore" garage bands who can't play music but still garner radio play and media attention.
1: I know I asked for a super-size but I'm starting to feel like a fattie. Pass the salt.

2: Nick was only one lesson above the girl he was tutoring, but he could slap bass like the Fattie he is and that's good enough for her and his bandmates.
by Prof. Wreck May 9, 2007
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Someone who is fat and is referred to as "fatty"
Or a nicely packed joint
Hey fatty, get your fat ass over here!
Or
Yo homie, you rolled a fatty.
by Korea February 16, 2005
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1. A short and wide Joint.
2. Insult towards an obese person.
1. Yo lets go roll a fatty!
2. Here fatty, come get your brownies!
by GangstaBoi February 22, 2006
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fatty(noun) - a person who is not literally fat but being called fat from the outrageous amounts of food he or she contain in a daily basis.
wow he's such a fatty... he just ate that whole enchilada yet he looks exactly the same!
by jsp009 December 8, 2009
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