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3.
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
 
1.
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
 
2.
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
 
4.
Talking with someone in more than 1 way at a time. Like AIM, facebook, texting one person all at the same time.
Me and Kim were multi chatting last night, I have no idea why we didnt just call each other...
by Wakkkkaa November 30, 2008