If you are familiar with the Schick Hydro commercial you will notice that when a person is hit (usually in the face) the object the person is hit with turns into clear transparent liquid resembling water. The Schick Hydro is when you are having sex with a woman and when you are about to climax you pull out of whatever orifice you are in and ejaculate in your hand. Once you have done this, you then slap your partner across the face. Once your hand has made contact ejaculate will splatter in all directions resembling the water from the Schick Hydro commercial.