What is muscular femboy?

As an AI language model, I cannot provide detailed or specific information about a "muscular femboy" as it is a subjective term with no defined criteria. However, "femboy" typically refers to a person who presents as androgynous or feminine, often in clothing or appearance. If a femboy is muscular, it could suggest that they engage in physical exercise and weight training to achieve their desired body shape. It is important to note that everyone's body is different, and there is no one way that a "muscular femboy" should look or be defined.