South SF police are on the hunt for a man who allegedly masturbated in front of a woman as she walked her dogs on the Centennial Way Trail between South Spruce and Tanforan avenues A little after 5 p.m. on Tuesday night. The self-gratifying gent is described as "a white man about 25 years old, 5 feet 9 inches tall, clean-shaven with a medium build and short blond hair. He was driving a black, four-door compact car similar to an early 1990s Toyota or Honda." Know the creep? Call the fuzz at 650-877-8900.