Touching a person's sex organs for pleasure. This could be a male rubbing his penis or a female rubbing her clitoris because it feels good. People can do it alone or with another person. MASTURBATION is not harmful. It does not cause acne or blindness, make people crazy or cause any other awful things to happen. Almost all men and many women MASTURBATE at some point in their lives. Slang terms: beating off, whacking off, beating your meat, jacking off, jilling off, jerking off, bopping your baloney, yanking, diddling (usually for females), circle jerk, choking the chicken.