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A fan of Justin Bieber that has a taste of music similar to that of the flavor of cow feces. Any believer of Justin Bieber have an IQ that creates a new category in the IQ chart below Profound Mental Retardation and is a negative number or beyond.

Beliebers tend to despise men, haters of Justin Bieber, and have a daily habit of collecting anything that is relevant to Justin. They will deny anything a hater says and will only love Justin Bieber.

Scientists say that beliebers are a sign that the world will end. How this is so is that beliebers will spread their lethal disease known as "Bieber Fever" to other women, which would cause divorce, conversion of sexuality into being a lesbian, dreams of Justin Bieber, and lack of the natural ability to search and mate with males. Then, the beliebers will attempt to go to Justin Bieber, in which she may reject, thus causing suicide from big fans of Justin. This will heavily reduce the human population and thus cause the collapse of civilization and the extinction of the human species.

The only way to prevent this worst-case scenario is by murdering Justin Bieber, which will cause the current beliebers to commit suicide and to prevent the spread of Bieber Fever, thus saving the future generations and bringing the end of the horrible pandemic.
Belieber: I love Justin Bieber.
Boyfriend of belieber: *facepalm*
Belieber: What?
Boyfriend: I can't believe you became a lesbian now!
by Metalhead34 February 17, 2011
one who is an obsessive fan of justin bieber.
once i saw his face, i was a belieber.
by abbiebeliebes:) October 17, 2009
A person who loves Justin Bieber & beliebes in everything that he can do
I am a Belieber because i respect Justin Bieber and I believe in him.
by ABelieber January 16, 2010
Belieber is a HUGE Justin Bieber's fan. Fan and Belieber is really different, Fan will leave him just because a little thing, but Belieber is not going to leave him eventhough the biggest thing that can break a relationship.
Fan: I love Justin Bieber! Belieber: I love KIDRAUHL! Fan: who's Kidrauhl? Belieber: GTFO!
by BELIEBER FOREVER June 23, 2012
To Believe in or be a believer in Justin Bieber.
"I'm a Belieber"
by bieberluv96 January 21, 2010
A 'belieber' is a fan girl of teeny bopper sensation Justin Bieber. They are usually between the age of 10-15. A lot of them spend most of their life on Twitter where they:
-Tweet about how much they love Justin Bieber
-Shout-out other 'beliebers'
-Use a lot of tags like #ifollowback or #teamfollowback.

Other twitter users who are not beliebers (and/or above the age of 15) get rather annoyed by the insane amount of 'beliebers' on Twitter and counter act with tags like #Justinbeibersucks.

Beliebers are also well known for fainting at Justin Bieber concerts/appearances. They are also well known for covering their room and school books with pictures of Justin Bieber.
#bieberfact he said the best thing about his fans is that we all stick together as one big family. RT if you are from the belieber FAMILY
by Smashley91 July 04, 2010
A fan of and/or believer in Justin Bieber. In case it wasn't obvious, it's a combination of believer and Bieber.
When Neil Diamond's and Smash Mouth's hit song "I'm a Believer" was remade to "I'm a Belieber", all JB's fans similtaneously Biebergasmed and then procceded to Bieberblast the song on iTunes.
by MusicMan#2489 March 29, 2010
a person who is either obssessed with justin bieber, likes his music, or likes anything that has to do with justin bieber
That belieber just went to Hot Topic to buy a justin bieber t-shirt.
by bieber's shawty May 21, 2010