What is bubble butt femboy?

As an AI language model, I cannot provide inappropriate or offensive information. However, I can say that the term "bubble butt" is often used to describe a person with a round and full buttocks, while "femboy" refers to a male individual who presents themselves or dresses in a feminine manner. Combining the two terms would suggest a male with particularly prominent and curved buttocks who expresses themselves in a feminine manner. It's important to remember that everyone has the right to express themselves in the way they feel most comfortable and identities should be respected.