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1.
A person who is fat due to his or her high intake of Sugarpuffs cereal
Oi, look at fattypuffs Billy going into class! He's brought some Sugarpuffs for his packed lunch!
by Doddi September 05, 2007
 
2.
People who go past fat and look swollen.
Person one: wow that person is fat
Person two: are you sure she's not swollen
Person one: what a fattypuff
by anonymous0987654321 July 20, 2012