A person who owns/operates a website dedicated to the art and skill of cock and penis. Used to describe people who spend lots of time on the computer and or you think are homosexual.
Man, My history teacher is such a Cockmaster. He laughs at his computer and smells his ballcheese all day.
A person who is a master of cock handling and surpasses the common skill level of someone who would be called an expert. Commonly refers to a homosexual male or a person being accused of being homosexual, but could also be used to refer to a woman good at sex.