O.B.E.C.
A person who’s so full of themselves that they think they’re the best at everything. They’ll tell you they’re the king of the world and you should bow to them.
He got O. B. E. C. because he said he was the best at everything, even eating pizza.
My friend got O. B. E. C. when he said he could beat anyone in a dance-off.
She got O. B. E. C. because she said she was the best at math and art and basketball and everything.