L.U.P.O.S.
A being that makes other people look good by comparison. Like a broken toaster in a kitchen full of chefs.
You're L. U. P. O. S. You couldn’t even finish the game.
That kid's L. U. P. O. S. He fell asleep during the movie.
You're L. U. P. O. S. You’re the reason I failed the test.