Being famous for absolutely no reason at all

A Kardashian is something, that makes you dumber, just by being exposed to it.

Every type of cancer.

A beautiful nobody........famous only thanks to physical attributes and free exposure via the internet.

n. A toxic blight on humanity.

someone who is absolutely worthless and yet they become more successful than those who actually contribute to society.

Verb: to become a superstar, simply by virtue of proclaiming oneself a superstar. Oh, and a strategically released sex tape never hurts.