I have this from a Dr Demento collection. It's a single available on Amazon. I hear it regularly on my mp3 player at the gym. It always makes me try harder.
I like a lot of parody songs, but to make my list the parody has to contribute something special, make me laugh at the shallowness of the original, or simply be better. This qualifies on all counts. I especially like it when it comes up while I'm trying to get in an extra rep of something hard. The original Desiderata is available on youtube and you probably won't like it after listening to Deteriorata. But you really should listen to it. I find I have a hard time listening to the original now. A small amount of background is available on Wikipedia.