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1.
The "religion" of people who are fan of the popular anime series 'The Melancholy of Haruhi Suzumiya'. Haruhism 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"
Haruhist people practice Haruhism and Hare Hare Yukai!
by haruhiiist January 04, 2011
 
2.
A term describing an event when everything goes your way, despite all odds or the current circumstances.

Pronounced Ha-ru-hee-ism
He didnt study for the final at all, but the teacher got hit by a car and it was cancelled. He always seems to get haruhisms.
by Durandal June 24, 2006