Pub fishing, or "fishing" in a pub context, is not related to traditional fishing but rather a term used to describe a social activity in a pub or bar. It typically involves patrons trying to "catch" the attention or interest of someone they find attractive, similar to the way a person might use bait or lures in fishing to catch fish. The concept often involves light-hearted flirting, socializing, and attempting to make a connection with others in the establishment.