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3.
When people (especially cops) stand around not doing their jobs but instead eating food and/or drinking coffee.
Joe: Wow, this traffic is really backed up. You'd think the cop would be directing all the cars.
Billy: No, he's too busy fatassing. Look he's got a donut in one hand and a coffee in the other!
by LuLuAiC May 03, 2009
 
1.
To Procrastinate or eat excessivly
Stop fatassing and get back to work!
by Lord Djem So January 06, 2008
 
2.
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
by Dorrrraaaaaa July 01, 2009