What is what does mmm mean from a guy?

As an AI language model, I do not have the ability to determine what does "mmm" mean in the context of a guy. However, "mmm" is an onomatopoeic sound that is often used to convey a variety of emotions or physical responses such as satisfaction, pleasure, approval, or agreement. It can also be used as a filler or an expression of uncertainty or hesitation. The meaning of "mmm" could depend on the tone, context, and body language of the person using it.