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1.
A person who is a fan of the popular anime series 'The Melancholy of Haruhi Suzumiya' sometimes describes themselves as being a "Haruhist" or follows "Haruhism". Haruhist is taken from the first name of the main character of the anime, Haruhi Suzumiya. Haruhist's usually participate in activites related to the anime, such as doing the popular dance seen in the anime (Known as 'Hare Hare Yukai'), as well as other activites such as forming their own "SOS Brigades"
"Yeah, I've totally being a Haruhist after watching the anime, I learnt the dance yesturday!"
by Painkilla May 14, 2008
 
2.
1. A group of people worshiping an character from a popular anime, (prone to horrible dancing to parodies of the theme song.)
2. Sad people who like the horrible Japanese TV show Haruhi Suzumiya waaaaaay too much
3. Aids
That Haruhist can't dance.
That Haruhist never moves.
That Haruhist is gay.
by Leader of the Anti-Haruhism movement September 11, 2007