m'dear
A rude short way to say my dear. People use it when they’re being extra annoying or trying to sound fancy. It’s like calling someone your idiot but with less swearing.
M'dear, you just spilled coffee on my brand new suit. Again.
M'dear, I didn’t ask you to do my taxes. I asked you to be quiet.
M'dear, your face is making me sick. I swear.