Top Definition
When Facebook chat or another chat service stops working suddenly, in the middle of a conversation
FB CHAT
You: so can you go this weekend? 9pm

Me: yea, I'd love to 9:01pm
An error occured

(next day at work)

You: wtf, you never responded!

Me: sorry, Chatfail
by Wowreallynow April 20, 2010

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