Top Definition
Deit-bore, as opposed to dieter:

A fat person that incessantly tells the world how to diet or all about their own diet plans despite their never losing a single pound of weight themselves.
"Man, did you hear that sloppy Diet-bore tell me how she's gonna fit into her prom dress, just as she was slamming down a burger, milkshake and super-sized fries?"
by jagnot January 23, 2010

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