An elevidiot = and elevator idiot. One who tries to step into an elevator, as the door opens, before any of the passengers who are already inside have the chance to step out.
As our elevator reached our destination, the door began to open. As I was about to exit another person tried to step inside the elevator (before I could get out) almost bumping into me, causing a moment of confusion/akwardness. As I left, crossing in front of him, under my breath I sighed "you elevidiot".
The small video monitors that are now often featured in the elevators of big, newer business buildings. They show headlines, weather, sports scores, trivia, etc. They are also impossible to take your eyes off of, no matter how many times you've already seen what they're showing.
Now people have an excuse not to look ateach other in elevators. They just keep their eyes on the elevisions.
Chiefly northeastern American act of entering an elevator by moving to the nearest corner, out of sight of other would-be entrants, to avoid feeling compelled to hold the door open for them.