Everything and Zen (Bush) 3

Like most of their stuff, catchy tune, but I couldn't understand a damn thing he was saying.  Then when I looked up the lyrics, I realized that it still doesn't make any sense.  "Mickey Mouse has grown up a cow"?  What does that MEAN?  On another song, it sounds like he's saying "Got a mushy head" instead of "Got a Machine Head", but I still think my interpretation seems to actually make more sense.