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1.
n. Instant Messenger; any of the instant messaging services available via internet comprised of a buddy list and the ability to instantaneously send and receive short typed messages on a computing device.

Origins.
2009-10; Derived from chit-chat but applicable only in reference to the internet and computing realm.
Johnny B. "I'll catch you on the chitty-chat later"

Jane J. "We should use the chitty-chat to coordinate the best time for everyone to meet up later"
by noooo names please April 06, 2010