L.U.P.O.S.
A person so worthless they could be used as a mop. And still wouldn’t clean up the mess.
You're L. U. P. O. S. I saw you throw the pizza on the floor.
That kid is L. U. P. O. S. He cried when he got a B.
You're L. U. P. O. S. You couldn’t even beat the level.