Moomy
A childfree insult for a female breeder. Sometimes "Moomie," or "Moo" for short. So-called because such women drop offspring like cows do, seeming to have little other purpose in life, and sometimes conspicuously breastfeed them in public. They often also bovinely ignore them...unless you attempt to discourage their crotchfruit from screaming or otherwise misbehaving in public, in which case they will begin lowing like an angry cow whose calf has been threatened.
That stupid Moomy was letting her little bastard tear up the entire supermarket while she stood obliviously in the frozen foods aisle.