The Default and only Instant Messing or "IM" application ("app") shipped with the "Macintosh OSX" Operating system.
iChat can connect to ".Mac" - A serive offered by Apple, AOL's "AIM" and a few others.
There was a cloned version of iChat for Windows in the past, but from fear from Apple legal, it was pulled offline.
iChat, it's like AIM, but better...
by GrayApple May 14, 2006
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When your friends set up a Macbook on a desk and covertly video iChat you while you have sex and they watch on the other side.
"I found out I got iChatted last night while hooking up with this chick. I'm gonna kill those fuckers."
by Charles Gillum April 20, 2008
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When your friends set up a Macbook on a desk and covertly video iChat while you have sex or do something incriminating without you knowing.
"Yo dude, I found out I got iChatted last night. I hope that shit doesn't get out onto the internet!"
by Charles Gillum April 20, 2008
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Wanting but not having an instant messenger application, so to recreate the experience, going on chatroulette and clicking "next" until you and your friend find each other.
"Yo, I'm going to be at my grandmas house this weekend, and she wont let me download aim...wanna try ghetto ichat?"

"Miles and I tried ghetto ichat for like 2 hours last night, but we never found each other... only about 7,000 dicks."
by ccfornever May 19, 2010
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when people graduate or move and find new friends; usually deleting people they do not talk to any more on i.m. accounts
Mike got rid of me on his i.m. account during his iChat cleanup
by Kev :-P June 13, 2008
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An iChat Vibe, is the particular tone one interprets through the text received in an iChat conversation. This is often unreliable, because of the inability to hear the tone intended.
Dan: Did you talk to Amanda last night, she said she was gonna IM you.

Antonio: Yeah but she was giving off this iChat vibe, and then she signed off. I think something's wrong
by DeLaSerna January 7, 2009
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one who explores in video chats WAY more then the common apple user.
Ilana is a ichat slut. As we speak!
by Maxx Schumann October 11, 2008
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