To fiercely jab someone with your fingers on the top-left or top-right of the torso. This is designed to be incredibly painful if done correctly. Upon successfully scorpion punching someone, the attacker must yell "BITCH!" in order to claim supremacy over the victim.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.