A misspoken mix between 'Impersonate' and 'Imposter'. First coined in 2008 by Cameron Haskins.
V.-To assume the character or appearance of, especially fraudulently.
Tim, look! That guy is totally trying to imposternate you.
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A person that is trying to be someone that they aren't.
Mickey: You are such an Imposternator, you copy everyone.
Carl: Yeah, sorry.