I think that "Joanne" wasn't written about a cow (moo!) when Nez wrote it, but later he thunked it up and realized how hilarious it is to say that "Joanne" was written about a cow... so he said that "Joanne" was written about a cow. Moo.
You're still my favourite girlfriend Alice Long
And I don't forget about you when you're gone
Even though right now you feel you don't belong
You're still my favourite girlfriend, Alice Long