L.C.L.Y.
L. C. L. Y. is a person who thinks they're the greatest, but they're just a big mess. They talk like they’re a rockstar, but they can’t even do simple stuff right.
My brother L. C. L. Y. said he could clean my room, but he left it worse than before.
My classmate L. C. L. Y. said he could win the science fair, but he didn’t even know what gravity was.
My dad called me L. C. L. Y. because I said I could do my homework, but I didn’t even start it.