What is Cock-watcher?
1.
A guy that watches other men change in the changing room or other area that he can catch a peek. He then compares and announces to others in a manner such as " look at the size of Chevys Cock!!!!'
Guy in hockey dressing room.
2.
Someone, usually a non-homosexual teenage male, interested in comparing the size of his penis with anothers, who keeps looking at superior specimens.
That guy was staring at my one-eyed-monster for twenty seconds in the showers. He's a cock-watcher!
See