The official endearing term for two girls over 40 who decide to give up on finding a decent man and become partners. Now...these girls are not lesbians. They simply live together and reap the financial benefits of having a partner (besides insurance, because they don't actually get married). If two girls give up on men and become hubbins, they will have separate bedrooms, but will snuggle on occasion as well. Hubbins have an "open" relationship, meaning they are free to continue to sleep with men, whomever, and however many they so choose with zero obligation because they already have someone to go home to...their hubbin!
NON-decent guy: Hey what you doin tonight girl?
Hubbin: Oh, nothing, just a normal night at home with my hubbin.