not physically being fat, but knowing that you would be fat because all you do is gobble down food.
Tina was mentally fat after her third plate of nachos.
by SARIE777777 March 13, 2008
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an intellectual state in which one is of well below average intelligence.

100% of the time, the mentally fat person is completely unaware of their intellectual condition.

Note: Physically attractive people can most certainly (and often times are) mentally fat.
Man, she was so hot but seriously, that girl is so goddamn mentally fat I could not stand another second in her presence.
by Brian Adelman May 2, 2010
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Characteristic of craving food and eating it, while not gaining a pound.
This Greek kid Chris is always craving steak and sushi. He is mentally fat.
by AGP819 January 24, 2020
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Basically craving for food and eating it and not gaining a pound.
Some Greek kid named Chris is mentally fat and always craves Steak and sushi.
by AGP819 January 24, 2020
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1. (n) The state of mind in which your body thinks it is fat, when there is no physical evidence of obesity.

2. (t.v.) When all one sees around them is turned into a food.
1. (n) 'Stephanie's fat mentality is so bad that she thinks she must lose weight in order to look like Larry the Cable.'

2. (t.v.) Jimmy blamed the fact that he ate his computer on thinking it was a McDonald's Big Mac.
by JJJ'S September 5, 2008
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A term that can be used to describe someone who is lazy, or even just stingy. A person who hogs all of their food, even if a starving person asks politely.
Wyatt: "I didn't have any breakfast, and Spencer is being Mentally Fat."
Spencer: "I'm not fat!"
Wyatt: "I said you were Mentally Fat!"
by Adumb50 May 13, 2010
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