Mingender (shortened to MIN) is an umbrella term for all genders which are masculine in nature (MIN). It can be used as an umbrella term for any genders that are primarily related to masculinity. Mingenders may or may not also be related to manhood.
It can also be used as a gender on its own, referring to any gender that isn't fully defined by masculine but but is still related to masculinity, or a gender in which masculinity is its defining feature but the gender is not binary male. It's often used by individuals who cannot narrow down their gender any more than being masculine, but still definitely not a binary man.