l33t0r
Someone so good at something they could beat a dog at chess and still have time to eat your lunch.
My brother is a l33t0r at math. He solved the problem before I even finished copying it.
That kid at the store is a l33t0r. He remembered every customer’s name and favorite snack.
My mom is a l33t0r at cooking. She made a cake that looked like a spaceship.