A blend of the words "mediocre" and "
idiot." Used to describe someone who is foolish or incompetent, but is remarkably unexceptional at it. They aren't spectacularly bad enough to cause real
chaos—they are just thoroughly average at being an
idiot.
"Kevin forgot his own password
twice today, but he didn't
even lock himself out of the account. He's such a meidiot."
"
Don't worry about his evil plot; he's too much of a meidiot to actually pull it off."