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1.
A term used for something that is ambigious. Not sure of what something or who someone is.

It can be used in the same situation as a simple "I don't know". Is normally after the words "Who is"
Person 1: Have you seen my pen?

Person 2: Who is John Wray?

or

Person 1: Who is that guy over there?
Person 2: Who is John Wray?
by J H Norway October 02, 2010