The term "ball club" has several meanings, depending on context.
1) In a general sense, it can refer to any social group or organization that engages in recreational activities such as playing sports, dancing, or attending events together.
2) It can also specifically refer to a team or group of players involved in baseball, which is often called "the ball club" when referring to the entire team.
3) In some regions, particularly in Britain and Ireland, it can be used as slang term for testicles, derived from the idea that they are like small balls being hit around by a game of sports such as cricket or tennis.