l33t0r
A person who is so good at something they could beat a chicken at a race and still have time to take a nap.
My neighbor is a l33t0r at gardening. He grew a tomato so big, it had its own Instagram.
That kid in my class is a l33t0r. He solved the math test before the teacher even handed it out.
My brother is a l33t0r at video games. He beat the level so fast, the game started a new one on its own.