mentally fat 

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.

mentally fat by SARIE777777 March 12, 2008

Mentally Fat 

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.

Mentally Fat by AGP819 January 23, 2020

Mentally Fat 

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.

Mentally Fat by AGP819 January 23, 2020

mentally fat 

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.

mentally fat by Brian Adelman May 1, 2010

Mentally Fat 

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!"

Mentally Fat by Adumb50 May 13, 2010