raindrops are fallin on my head
Consists of laying on your back and leaning one's butt against the wall in such a way that your hips are above your head, once in this position the masturbator begins to stroke himself, and when an orgasm was achieved, semen would discharge all over one's face, mimicking the effect of raindrops falling on one's head.
One of John Wayne Gacy's favorite masturbation techniques is the raindrops are fallin on my head.