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1.
To face the back wall while playing a guitar or bass on stage, often to conceal shyness, or give one the impression there is no audience.

Often employed by serial users of the "bass pout" in order to avoid being mocked, postgig.
"He was so tied up in his walled shame, I didn't even notice he was on stage"
by Captain Ace McKenzie March 13, 2006
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