There are two things going on with the pimp slap. One is a central nervous system strike of the brachial plexus, the second is circulatory strike of the barrow receptor on the side of the neck. The BR is what controls your BP like a thermostat. Think of it like the carnival thing where you use the hammer to hit the thing to go up and ring the bell. When it is struck your body goes "oh sheet our BP just skyrocket" so within a millisecond it bottoms it out to attempt to regain homeostasis....and you see the effects. We teach it as a strike and pinch for different applications.- George
That sounds pretty neat. I need to learn more about it.