Check It out I found an definition on a Haruhist
Haruhiism is an inexplicable (for non-Haruhiists) devotion to one of the following enitites: (not mine)

1) Suzumiya Haruhi
2) Kyon
3) Any other member of the SOS団
4) The SOS団 itself
5) Derivative works of the SOS団, or involving the SOS団.

This includes, but is not limited to, the serialised novels that detail the SOS団, including the anime and manga derivatives of those novels. It also includes the members of SOS団 themselves, and to a lesser degree those members’ friends.

Typically, Haruhiists (those who practice Haruhiism) experience a strong desire to understand, to share or to observe details involving the above entities. Typical Haruhiist activity includes speculation and discussion of the SOS団 and its derivates, its members and their peers. Examples include, but are not limited to, the posting of such speculative material, the discussion of the most recent SOS団 activities, and the desire to capture as many images of the SOS団 as possible, displaying them in a hypnotic jumble that, while frightening to the outside observer, creates a feeling of peace and/or devotion in a Haruhiist.

The requirements of Haruhiism are not stringent; all that is needed is a belief in the SOS団 or one of its derivates, and membership is self-declared and @A*(’;72KJ entirely voluntary. Members are, technically, free to leave at any time; however, this is a very rare occurence. It has been said that noone can truly cease to be a Haruhiist. Further speculation points to a theory stating that everyone is, in fact, a Haruhiist; they just have not come to realise it.

Well I’ll keep this going, SOS Brigade will never die
For starters I ticked off at the fact that I spelled Haruhi’s name wrong in my previous post