Top Definition
A very simple yet effective insult directed towards people who both purchase and drink diet/caffiene free/ or sugar free drinks. And who are as well vegitarian, or eat healthy.
A: Hey guys look at me, i bought a pepsi max!
B: Shut up Diet Face

A: I'm full, want my tofu.
B: Sorry i don't except crap from you diet faces.
by Tyson Sinclair October 26, 2006
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