Fune is one of the greatest powers of the universe. Much like the force, it can be used in negative and positive ways.  If you believe that in any way you are Fune, you are not fune. 

Fune can only be defined as of or containing a vast amount of funeasciousness by those funetastic people who have reached funervana. (Also known as not you)

If you would like an easier explination, the following may help:
Mr. Skull face is FUNE
Arty the Merekat is FUNE
Mr. Mullet man is FUNE
Jen and me are the Funest
These horses are not fune, because they are ugly and they......
about what fune is and how they can be fune.......... don't be them.  Just take it like a man, suck it up and sucumb to the uncanny power of fune.......