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A person that goes to extremes in defending their chosen smartphone, software, or console against fans of competing products.
Gary: I love my iPhone!

Jim: Your iPhone sucks! I will come to you in the night and burn your house down, after which I will do horrible things to your person.

Gary: Dude, chill! Don't be a fandamentalist! Your Android is cool too.
by thatonehotterchick August 22, 2011
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A person that truly believes that a celebrity's stage persona is their real one.
Dude A: Dude, David Cameron is a real West Ham supporter, I like that guy!
Dude B: Dude, he pulled that outta his ass!
Dude A: Nah, he didn't!
Dude B: You are such a fandamentalist!
by Juggles The Clown May 13, 2016
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