Exhibiting behaviors consistent with an unhealthy lifestyle and specifically known to increase ones body mass.

Term commonly used when someone is over ordering fast food.
Dude really? Two double cheeseburgers? Your Fat Bastard Syndrome is really flaring up.
by Stew Knod February 15, 2022
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When someone is a lazy bones and eats and sleeps 25/8
Keira has fatbastard syndrome she hasn’t left her bed all day fat bastard syndrome will become really fat bastard syndrome when some one is a really fat bastard
by Haha its me bish July 2, 2018
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