Here's a breakdown:
* Disestablishment: This means the act of removing an official connection between a state and a particular religious institution.
* -arian: This suffix often indicates a follower or supporter of a particular doctrine or belief.
* -ist: This suffix indicates a person who holds a particular belief or engages in a particular activity.
So, a disestablishmentarianist is someone who believes in the separation of church and state, advocating for a system where the government does not endorse or support any specific religion.
This word is often used in a humorous way because it is so long and complex. It's actually a good example of how adding suffixes to words can create new and often amusing terms.