iChat 

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...

iChat by GrayApple May 22, 2006

[iChat cleanup] 

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

[iChat cleanup] by Kev :-P June 13, 2008

iChat Vibe

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

iChat Vibe by DeLaSerna January 6, 2009

ichat slut 

one who explores in video chats WAY more then the common apple user.

Ilana is a ichat slut. As we speak!

ichat slut by Maxx Schumann January 21, 2009

Ghetto ichat 

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."

Ghetto ichat by ccfornever May 19, 2010

iChallenge 

when you put your iPod on shuffle and listen to every song without changing songs

Only a ninja can complete the iChallenge.

iChallenge by aznboi1337 March 2, 2010

Ichabod 

In reference to the Headless Horseman, an "Ichabod" is a man in an online personal ad who will show you every private part he's got, but not his face, resulting in an endless array of headless profile shots.

Wow, did you check out that profile!

Yeah, but he's probably got a face like a mud fence... Geez, put up a face pic! It's the 21st Century, Ichabod!

Ichabod by the modhatter September 23, 2011