When you are chatting with several people at once via IM (instant messenger).
"No, I haven't been able to look at that website you just told me about. I'm multichatting."
by Aaron Martell December 12, 2007
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Simultaneously having an online IM chat with several people while also sitting within conversation distance of said people in real life, especially on Facebook.
Random guy: Hey, what are you guys all laughing about?

Chatting guy: We're all multichatting on Facebook.
(gets a message)
Chatting guy: LOL, he totally does!
by The Green Pirate March 18, 2011
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chatting online with multiple chattees at the same time
I was multichatting this morning with 12 people at the same time, a personal best, but hard to control.
by Jimmy Cinders October 01, 2010
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