A shman is a human being whose gender is completely beyond you. You will see them on the street, on TV, in pictures, or in various other places, and you have no idea whether they are male or female.
A she-man (shman)a man possessing slightly affeminite manerisms. Seemingly manly, good looking, with slight hints of possibly being gay, but you're not sure.
A Shman is a person who you consider to be more than a friend. The bond you have with that person is what binds your two worlds together and allows you to never fall apart. It is much like the Nuclear Strong Force but much, much stronger. You may have only one Shman. If you have 3 that is called Trishmecta but there is only one in existence and will only ever be one.