Bilbo Thumper

Bilbo Thumper, n. 1. a Tolkien enthusiast who takes the spiritual/mythological aspect of the Middle Earth mythos much too seriously, to the point of pretending to worship Eru and/or the Ainur. 2. (possibly pejorative) any Tolkien enthusiast. [GJ1]
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Addendum: A play on the term "Bible thumper." [GJ1]