Does the code apply to anything online? I know there is a Yiff code and a Fur code and I ran 'em through both, coming up with error messages, which leaves me to conclude it isn't that.

If it is "just a guessing game" I'd say that the Geoson code applies to your wolf fursona and the Nimbus one to your fox fursona and that either your fursonas can cast magic (dark arts / elemental arts), or you are interested in such things, although whether via academic study or thinking one can cast spells is unclear. Elemental arts can also apply to Wiccans or Druids, (if I remember correctly). Dark arts on the other hand are traditionally tied to Satanism or "black magic" (generally viewed as bad, although in vid games, it can be pretty destructive, sometimes in a helpful way).

*not sure if that answers the decoding question*

No it doesnt, but i can tell you that it was interesting to read in the time being^^

What does the code mean then, if anything? Have you been able to figure it out?

no I havent figured it out, but hey, somethings in life arnt meant to be figured out^^