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interj. 1. An indication of confusion, usually spoken with a quizzical tone: "Wall??"

2. A request for further explication.

Compare octal forty.

It is said that "Wall?" really came from 'like talking to a blank wall'. It was initially 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.