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antidisestablishmentarianistically 

"Behaving in the manner of a person who is in opposed to the separation of church and state".
It is a construction of the word disestablishment which was the separation of church and state.
It can be constructed further to 'propseudocontraneoantidisestablishmentarianalistically' whcih means "In favour of the false behaviour in the manner of a person belonging to the movement opposed to the new version of the movement opposed to the separation of church and state".
Basically just an example of how complex the english language can be:P
I behave antidisestablishmentarianistically.

antidisestablishmentarianismistically

in a antidistestblishmentarian manner; Being opposed to the belief that there should no longer be an official church a the country. The word is sometimes quoted as the longest word in the English language. There is a town in Wales with a larger number of letters, but it is a place name, not a word.
Let's get one thing straight: while antidisestablishmentarianismistically is a real word, that has been really used with real meaning, it is mainly known for being an extremely long word.

antidisestablishmentarianismist 

One who is against being against the separation of church and state.
One who favors a state religion would be considered and antidisestablishmentarianismist.

antidisestablishmentarianistically 

The way to use the longest word in the dictionary in such a way that it makes sense in conversation.
I wouldn't agree with what you just said, antidisestablishmentarianistically speaking, of course.

Antidisestablishmentarianismificationizing

When you add more suffixes to the word antidisestablishmentarianism. Just to make it longer.
Antidisestablishmentarianismificationizing

antidisestablishmentarianismically 

The act or state of mind of being against a group whom are against an establishment.
The civil servant seemed to react antidisestablishmentarianismically to the new idea proposed by the militant Minister.
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