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1.
1) One whom pretends to be one pretending to be someone else.

2) One impersonating someone who is an impostor of another

3) Of, or pertaining to, the act of pretending to be someone who is pretending to be someone
Did you guys see Tosh's performance of the Tron guy? Yeah, that guy is such an imposinator.
by Phakade July 24, 2010