1)owning all of the LOTR extended editions, and watching the movies and special features multiple times per week
2)quoting at least 80% of the movie from memory and therefor ruining it for people sitting near you
3)owning multiple soundtracks of the instrumental music from the movies
4)owning many items of pariphenalia pertaining to the LOTR trilogy and/or using said items in public
5)dressing up in LOTR authentic costumes and/or participating in LOTR conventions and/or LOTR museum exhibits.
"Why is that guy such a weirdo? People say he's a LOTRist"
"He calls his dog with a horn of Gondor?! What a LOTRist"