L.C.L.Y.
L. C. L. Y. is someone who shows off like they're the king of the world, but they're just a bunch of hot air. They say they're the best, but when it comes to real stuff, they’re barely passing grade.
My neighbor L. C. L. Y. said he could fix my car, but he broke it even more.
My friend L. C. L. Y. said he could beat me at basketball, but I beat him and he cried.
My mom called me L. C. L. Y. because I said I could cook dinner, but I burned the pasta.