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(noun) A carefully camouflaged double chin that is strategically hidden with a poised hand, a book, etc. or a specific camera angle. This is mostly used on really good looking chics who are on the heavier side.
Guy 1: "Dude! Did you see this hot chic on Facebook?"
Guy 2: "Yeah, but look at the angle of her profile pic. I think she has a ninja chin."
by eviljew85 May 12, 2011
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