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Evidently this has been derived from CHAT + MARATHON.

to define a chat session or a series of back to back chat sessions that stretch for several hours together.
Tim: Hey Jack, how was your weekend?
Jack: You wont believe me man, I've been on chat for most of the day, like 6 to 7 hrs may be!
Tim: Damn man you're a Chatathon chatter! I cant even dream of doing that!.
by UD101 September 27, 2012
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