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Pretty much the opposite of obesity. Nobesity is the inablity to gain weight, no matter how much the individual eats and/or works out. Sometimes, weight loss may occur.
Tom: Hey, man, how much do you weigh?

John: 125 pounds! (56.7 kilograms)

Tom: That's weird, weren't you 135 pounds (61.2kg) last week?

John: Yeah man, I think it's nobesity.
by TheRealSquanto February 05, 2014
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