Millishit, in the metric system denoting a factor of one thousandth of a shit. If you give a shit, it means you care about something. If you don't give a shit, it means you don't care. So a millishit means you REALLY don't care.
The best character in Once Upon a Time. She plays the evil queen from Snow White. The most fierce, flawless human being you will ever set your eyes upon. She's even amazing when shes being a bitch, better even.
Did you see ReginaMills in last night's episode?! Her evilness surpassed all things.