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wall interj.
[WPI] 1. An indication of confusion, usually spoken with a quizzical tone: "Wall??" 2. A request for further explication. Compare octal forty. 3. [Unix, from `write all'] v. To send a message to everyone currently logged in, esp. with the wall(8) utility.
It is said that sense 1 came from the idiom `like talking to a blank wall'. It was originally used in situations where, after you had carefully answered a question, the questioner stared at you blankly, clearly having understood nothing that was explained. You would then throw out a "Hello, wall?" to elicit some sort of response from the questioner. Later, confused questioners began voicing "Wall?" themselves.
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