Handmand is a hand+mand. It means "hand mand" but together in one flowing word, "handmand". Typically a negative connotation, usually reserved for people that annoy other people.
A women who serves the patriarchy; i.e. Cool Girl. Handmaidens either defend, support or claim to love pornography, pedophilia, rape, incest, BDSM, surrogacy, egg donation, transgenderism and prostitution etc. They often deflect arguments against feminists with "but but but... women to it tooooooo". Many handmaidens claim to be (liberal) feminists and will attempt to euphemize and appropriate women's subjugation by rebranding it "empowering" or "feminist", such as "feminist porn" or "sex work empowurrs me rawrz". Supporting the trans lobby, the porn industry is a handmaiden's cause.
A fertile woman brought into a household where the wife is unable to conceive.
She will then help with odd jobs around the house, but will also be subject to sexual relations with the man/husband of the household in order to try and bear them a child.
She's a handmaid, she's got an amazing tale to tell.