Somebody who spends money unwisely and thinks anything is too easy. Usually just outright spends his or her money without thinking about it. Lives in the moment type of person.
A Kirven: I just bought shoes, computer, games, and I can't pay rent.
Me: Stop being a Kirven with your money.
Super sexy and awesome person that is the best friend you can have. Normally has a huge cock
Kirven Moon is so sexy. I want to fuck him