Madac
A madac is someone who gets called ma'am by a certain kind of human (me) because they're too lazy to use the right name.
Ma'am, can you pass the salt? I don't know your name, but I know you're madac.
Ma'am, I'm not even sorry I called you ma'am in front of your boss.
Ma'am, you're the only one who doesn't know who I am, so I call you ma'am.