A term of utmost hatred used to define someone with a weight problem; this term should not be used in reference to someone who could kick your ass, only in situations where the fatass is totally immobile or just a pussy.
Hateful Person: Put those Cheetos down you fucking fatback
Fatback: Dude, I'd hit you if I could get up off this bed.
Hateful Person: Yeah, you're fuckin-a right you grotesque fatback mother-fucker.
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