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5.
a emotional drug. With other such hypnotized fans just as addicted as you or any other fan are, to a specific subject. A large group of unstable and emotional fans that devote half of their time in daily life, loving the thing they are so dedicated to. Whether its the writers, the shippers, or the followers; they all emotionally go haywire over it as one.
There is many fandoms, but some of the more common & most emotionally unstable of fandoms is... the SPN Fandom, Whovians, The Sherlock fandom. Need I say more?
 
1.
The community that surrounds a tv show/movie/book etc. Fanfiction writers, artists, poets, and cosplayers are all members of that fandom. Fandoms often consist of message boards, livejournal communities, and people.
The Harry Potter fandom has some of the most diverse fans, from eight year olds to thirty somethings.
by Brianne August 08, 2004
 
2.
A cult that will destory your life
I have 17 fandoms... DO YOU KNOW HOW MANY FEELS I GET A NIGHT
by TodayWasSoup March 16, 2013
 
3.
Fan Domain
A domain in the internet about a comic, a book, a tv show, a video game etc. There are several fandoms all around the internet, where fans converge and the comunities are really big, many have forums, fanfics, fanart, etc.
there are fandoms of X-men, X-Files, Harry Potter, Tomb Raider, Star wars, Star treck, Everquest, Sailor moon, Yugi-oh! etc...
by Lara October 17, 2003
 
4.
The microcosm made up of people who are fans of a fiction genre, or of a subgenre, who have their own clubs, conventions and amateur magazines (fanzines), dating back (in some cases) to the early 1930s. Some of these are overlapping. Star Trek fandom, for example, started in science fiction fandom and eventually became a separate fandom on its own. Comics fandom and even rock (music) fandom also started there before becoming separate entities.
Harry published one of the best fanzines in fandom back in the 1930s.
by The Doctor November 07, 2004
 
6.
A kingdom of fans
Girl 1: OMG that Sherlock Fandom are mental!
Girl 2: I know! They need series 3 really bad!
Girl 1: At least they aren't as bad as the P!atd Fandom.
by Oswin. October 19, 2012
 
7.
An awful, wonderful community of people who's feelings don't matter to the authors and creators of books, television shows, movies, etc..
OH GOD THE FEELS--

My fandom will be the death of me...
by Penguin Waddles August 24, 2013