an anxiety disorder, when someone suffers from panic attacks to the point that they avoid so many situations they often become housbound. Not a fear of open spaces, in fact, when the word is broken down to original meanings, it means 'fear of the market place' in latin, which is a much more accurate description.
Derived from the Greek words Agora, meaning market and Phobia meaning fear. Agoraphobia is the fear of having a panic attack in a situation that would be hard, or embarassing to escape from. Usually accompanied and caused by GAD and/or Panic Disorder. Though cases without such have been documented, it's rarely reported due to less reason to seek medical treatment.
Outbox Agoraphobia is an anxiety disorder suffered by text messages. Much like the human equivalent, agoraphobia, outbox agoraphobia is where the text message suffers from panic attacks in the public, and so decides it best to stay in the relative safety of the outbox.
The condition is most commonly caused by lack of mobile reception and/or lack of mobile credit.
Side effects of the disorder include anxiety of the phone owner themself as they don't recieve a reply, and then annoyance as they realize the text is still sitting in their outbox ready to resend an hour later.
text conversation:
17.31-Phoebe: What time is the table booked for? x
18.26-Phoebe: James? What time is it booked for? x
18.27-James: Oh sorry! It was for 6pm, I thought you were late, I sent you a reply earlier but it had outbox agoraphobia! x