So totally better than you and then some. The best of everything and everyone. So much better than you, your mom, and your dog. Better than 1337, more than 1337, overly 1337, so 1337 it's painful. The best of all and everything and you and your dog.

Contraction of über (also, though incorrectly, known as uber) and 1337.

It means teh b3s7 of t3h 1337!

its used as a extention for 1337 it means more 1337 or very 1337 and is offerd used like "I am to 1337 for you" "No way! I am uber 1337!"