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An expression of aggravation, shock, or disbelief-- but mostly aggravation.

Orig.: English, 21st century. Fist usages traced to the "Personals" section of the Rutgers satirical paper The Medium.
Man 1: "Did that guy just casually scratch his nuts and smell his fingers?"
Man 2: "C'mon naw!"
by Spicy Caramel April 26, 2009
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