Top Definition
RBNR is used in a chatzone where someone reads a message and doesn't reply.
Here's an example of someone Reading But Not Replying in a chat;

19:01 Dan: Hello? (READ 19:02)
19:03 Dan: I know your there:L (READ 19:03)
19:04 Dan: rbnr? (UNREAD)
by SamMorganOnline August 05, 2012

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