A fork of Rural Dictionary
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!.