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.

The act of smacking or otherwise striking something in order to restore its functionality. While it's success rate is questionable on electronic devices it seems to work more reliably on women.

The fine art of hitting or lightly tapping on an object to make it function as expected