you do this when you are about to go down on a girl thats on the rag. you pull out her tampon with your teeth and shake your head back and forth like a dog does when it plays with a chew toy. it will fling blood everywhere.
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.