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!
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."
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.
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...