The act of operating a motor vehicle and backing into or driving into something and then driving off as if nothing happened and no one noticed.
Oh man I just backed my truck into that van...hang on I am going to pull a Jimmy and drive off like nothing happened. We will drive around on the other side of that building to see if there is any truck damage.
the act of walking into a random room, usually a dorm room, standing or sitting there for an amount of time to make it awkward, then leaving without saying a word. Can also include a random story to make the situation even more awkward.
Note that this action can occur at any time of day, and the door does not even have to be open.
"Did Matt just walk into the room and then leave?"