What does it mean if someone calls you a scrub?

The term "scrub" is used as a derogatory term to describe someone who is considered to be unskilled, incompetent, or of poor quality in a particular area. It implies a lack of ability, knowledge, or experience, and is often used to criticize someone's performance, skills, or appearance. The term "scrub" can be applied to various contexts, including sports, academics, gaming, or any other field or activity where performance or skill is relevant. It is generally considered to be an insult and can be offensive to the person it is directed towards.