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1.
a male homosexual who likes to pitch and recieve anal.
Fattis is a rump ranger, butt pirate, fudgepacker, uphill gardner, butt ninja, and pillow biter
by reggie bush May 21, 2007
 
2.
A fat latin fellow.
Marcus Quintus is a Fattis!
by p33n June 28, 2003
 
3.
Super Long Shlong
OMG! Look at that Fattis!
by Jesus June 27, 2003