Percussive maintenance, also known as percussion therapy or a technical tap, is a term used to describe the malediction of an ill-behaved device to make it work, that is to say, swear at it and hit it. The origins and practice of the term are unknown, although some suggest the act became commonplace with the introduction of vacuum tube electronics. The term is a play on ‘preventive maintenance.’
The Daily Omnivore 
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