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A combination of the words "comment" and "contrarian" used to describe a person who frequently posts facebook/twitter comments about their opposing view and who rejects or resists the majority opinion.
Gene disagrees with everything. He's such a commentrarian.

I can always count on Jean to make a sarcastic comment on my wall. She's a hateful commentrarian, especially about religion and politics.

He is a total commentrarian. He will disagree with everything everyone says... all the time.
by gmcqueen December 30, 2010
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