The same as a Moron.
Someone who does not take all of Michael Moore's books and films with a grain of salt.
CLA Student: "OMFG! They showed Michael Moore's new movie this week in the campus theater. I was once a republican, but after that I think that I am a democrat."
Me: "You are a Moore-on"
A fan or follower of professional wrestler, Shannon Moore.
Crash Holly was the original Moore-on.