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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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A title resembling Lord or Sire when preceeded by "Witty"
Witty Fatty, you have returned from your quest to the fridge.
by fatty February 24, 2003
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Guy1: DAMN! shawty ass is big
Guy2: That's what u call a FATTY!

bootybuttass
by nellam22 May 12, 2009
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A person who is annoying or inhibiting your progress.
Person 1: Ogga booga!

Person 2: Stop being a fatty and start helping me cook
by Oliver Wernick June 26, 2009
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