mean mug: it is when you intensely stare someone down for a long-shorrt amount of time with your car window slightly rolled dowwn as if you are a black man hunting for a bucket of chicken or a house to rob but you are staring at a person
i walked down the street and this old lady was mean mugging me
The face you make when somebody gives you an inappropriate gift. Like when your cat brings you a dead mouse. You appreciate the effort but you can't fathom their thinking.
Dude! I guess Aunt Clara forgot you're not twelve anymore. You should have seen your Dead Mouse Mug when you realized she'd given you PJ's again for Christmas!