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phrase.

used to make a fat person feel fatter when they bring up food as a subject in a conversation. a fat joke usually follows...
tim: man i was watching the food network last night.....
edna: thats fat!
tim: huh?
edna: i bet you were masturbating with bbq sauce while watching it huh?
by mazimaz December 11, 2008
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2
a term used much like "That Sucks" or "That Blows"
Mom: NO Johnny, you can't go to the concert tonight. you have school tomorrow.
Johnny: That's fat...
by billybobjoecletus1234 November 12, 2009
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3
Doing, saying, or suggesting something that is characteristic of a fat person.
Chubby: Hey, lets dip these candy bars in peanut butter!

Friend: Man, that's fat!
by Sara Goldfarb May 19, 2007
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4
Doing, saying, or suggesting something that is characteristic of a fat person.
Chubby: Hey, lets dip these candy bars in peanut butter!

Friend: Man, that's fat!
by Sara Goldfarb May 19, 2007
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Get a that's fat mug for your girlfriend Helena.