Top Definition
A person who pretends they are someone else via text message. For instance: Picking up your boyfriend's cell phone and texting someone from his phone, as if you ARE the boyfriend.

Responding to a text message that wasn't meant for you as if you are the person it was meant for.
I thought I was texting Jim last night, but I found out it was actually Sally. What a textersonator, I'll never trust her again.
by Cassam September 04, 2010

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