Saw this last week Thursday or Friday, posted it on Facebook. Catchy music, kind of grows on you, and the lyrics are rather... interesting.
I had looked this up, found out that the two singers (brothers) actually host a show on Norwegian television, a comedy show (they are also a comedic band), and had done this video to promote their show; someone from the staff took it and put it online.
It isn't meant to be a new song, or an old one. Isn't even meant to be taken seriously. Sadly, most of the commentators on the original youtube page (and, I'll assume, all the others) have failed to grasp this.
I can just imagine all the mentally challenged people who thought ill of this song, only to find out it was never supposed to be serious.