the act of befriending guys in a social envrionment in order to get access to their girl friends. Normally if one were to approach the girl directly, the guys will prevent one from making any progress with that girl cockblocking, therefore dude chasing involves becoming friends with the guys in order to win their trust. It is a technique often used in a pick up artists circles.
Ryan was getting cockblocked by the Cindy's guy friends at Club Factory. Ben dude chased her guy friends, got their numbers, and ultimately Cindy's phone number as well. Ryan went home crying, but was happy when he got to play Marvel vs. Capcom 2 for xbox at home.