A person who is chatting with someone else on Google chat while also Gchatting with you.

To text more than one person at a time on the Gmail program.
If you are Gchatting with someone, and they take too long to answer or call you by the wrong name...they might be Gcheating on you.
by your pal Lisa May 12, 2009
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When you find out that someone you've been GChatting with is also GChatting with several other people.
Damn girl, you been GCheating on me?

When Tom called me by the wrong name during a GChat session in Civil Procedure, I realized he'd been GCheating the whole time.
by Malcolm Jamal Awesome October 29, 2010
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