This is a term for a mom who is still too involved in her adult child's life. Like still doing laundry, taking care of medical issues, and generally over-enabling. It's pretty terrible.
Desk Receptionist: "Good afternoon. How may I help you?"
Doing too much MOMS (DTMM): Yes, my son needs to see the dentist. NOW!"
DR: "Mam, he seems to be an adult. He's looks 30! I need for him to speak for himself. Sir, do you want to see the dentist?"
DTMM: "Don't answer, honey. I'll speak for you. Mommy is gonna make it all better. He needs the dentist NOW!"
DR: "Girl, you'd better stand your doing too much Moms ass back and let your son speak or it's on like Donkey Kong!"