from the word Percussion-to strike sharply and Maintenance -to fix Usually a quick sharp slap to the back of another's head.
usually delivered to stop said person in their tracks so as not to continue their stupid chatter or activity.
Also usefull if one can see stupidity approaching..one can administer some "Percussive Maintenance to stop it before it stops.
Joe strikes out with a lady at the bar.
Next day Fred starts to tell friends about it.
Joe delivers some 'Percussive Mantenance' to the back of Fred's head.
Little Johnny is throwing a temper tantrum...'Percussive Maintenance' is good here too