Top Definition
When on facebook chat, sometimes the chat history mysteriously disappears. Often you have just missed what the other person said and so will say 'chatblank' to let the person you are talking to know that the chat went blank.

Often caused by refreshing the page or clicking onto a different one.
Person1: And her was sooo wasted LOL!
Person2: sorry, chatblank.
Person1: hahaha that sucks, i said he was sooo wasted
Person2: LOL!
by garfieldphone July 16, 2010
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