Short for midnight dinner. When you have dinner at midnight or a littlelater because you didn't have it earlier.
Carla: "I worked 14 hours at the office and I can't believe it's 12 at night. I haven't even had dinner."
Dave: "I'll make you some pasta when we get home, babe. Your gonna have a nice midner."
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"