Someone who eats a lot. They don't necessarily always have to be fat.
Bob: Are you gonna eat all of your fries?
Boob: Yes, fatass.
by arizona July 14, 2012
A Person who has more than 1 chin and has big ass man tits bigger than any porn star and a stomach the size of a blue whale also will eat anything it comes in contact with.
"MIKE you fatass lose wieght!"

"No I like being fat jeezzz."
by Eric Shawn August 08, 2006
Someone with a very wide region for their ass to occupy in the world. They are usally made fun of their big ass

"Hey Fat Ass! Don't down, your big ass might break it!"
by UrbanTeen April 21, 2006
a big booty woman or woman with a applebottom
sir mix alot definition of the word fatass: "Baby Got Back"
by tapthatass September 08, 2005
some with an over-abundance of ass.
that bitch is a fat ass
by Bob December 10, 2003
some one really big, that ways alot
that bitch tiffany in my class is a Fatass
by dynokid November 01, 2006
Nearly half of the people in America. Maybe more.
Dude that guy's a fatass.
by sXe vGe April 29, 2010

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