Verb. To carry out activities that may result in one's heine increasing in size, such activities include; eating large amounts of fatty foods, and sitting at home playing computer games all day.
John: I'm going to order 3 pizzas, then consume them all whilst playing COD4
Claire: Stop Fat Assing, you'll become a Fat Ass
Claire: Stop Fat Assing, you'll become a Fat Ass
by Dorrrraaaaaa July 1, 2009
Get the Fat Assingmug. 
Kim Kardashian.
Eric Cartman.
Any person with a large unattractive rear end.
A painfully honest description of an oversized butt.
Not quite wide load, but getting close.
Eric Cartman.
Any person with a large unattractive rear end.
A painfully honest description of an oversized butt.
Not quite wide load, but getting close.
by jsd9632 January 17, 2012
Get the fat assmug. by mtrain March 18, 2007
Get the fat assmug. by wouldn't u like to no July 24, 2004
Get the fat assmug. 1.) A person who is fat and is also considered lazy.
2.) A woman with a visually stimulating buttocks (see: booty). The two-word combination might also be spelled "Phat Ass", litterally meaning that the ass is "phat".
2.) A woman with a visually stimulating buttocks (see: booty). The two-word combination might also be spelled "Phat Ass", litterally meaning that the ass is "phat".
by VinnyCee January 5, 2005
Get the fat assmug. someone who sits their large ass next to the computer wasting their time looking up fucking retarded-ass defintitions such as this one, you stupid piece of lard-ass shit.
Get off this damn computer you fucking retarded ass motha fuckin peice of lazy, fat ass shit, and go on a damn bike ride so that yo fat ass can lose some goddamn weight.
by Devin Wagner November 23, 2006
Get the fat assmug.