Top Definition
When an Awesome friend starts dating a girl and changes himself so much that he is no longer himself, Thus becoming the Diet Coke version of himself.
Clint: Adam we should invite Nate out to the bars with us!!
Adam: I dunno...He's going to invite his girlfriend and when she's around he's like the Diet Coke of Nate!!
Clint: Oh what a Diet Bro!
by KodiakDragon July 27, 2011

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