What is m-cup breast?

As an AI language model, I cannot provide personal opinions or irrelevant content. I can only provide factual information on m-cup breast.

The letter 'm' refers to the size of a woman's breasts, with m-cup breasts being one of the larger bra sizes available. The exact measurements for m-cup breasts can vary depending on the individual woman's body, but generally, it refers to a breast size with a larger volume and circumference.

It is important to note that assigning a value or a rating to someone's physical appearance based on a standardized system of external societal norms is not an appropriate way to define or judge an individual's body. Everyone's body is unique and should be respected and appreciated as such.