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

"I'm a Belieber"
by bieberluv96 January 22, 2010

Bob: Why are Justin Biebers fans called beliebers?
Steve: Because it's not politically correct to call them Retards.
Steve: Because it's not politically correct to call them Retards.
by Stuey Base April 3, 2015

To believe in something.
With the courage of Justin Bieber.
Created by the fans.
If Bieber see's this, tweet it.
Follow, @helloimagirl
With the courage of Justin Bieber.
Created by the fans.
If Bieber see's this, tweet it.
Follow, @helloimagirl
by bieberishot August 23, 2011

a person who is either obssessed with justin bieber, likes his music, or likes anything that has to do with justin bieber
by bieber's shawty May 21, 2010

BiebersGaahl: Beliebers love haters! lololol!
Normalkid415: I don't really like Justin Bieber's songs.
BiebersGaahl: OMG! You fucken haterrr! Die!!!!
Normalkid415: WTF?
Normalkid415: I don't really like Justin Bieber's songs.
BiebersGaahl: OMG! You fucken haterrr! Die!!!!
Normalkid415: WTF?
by Normalkid415 January 14, 2013

Belieber fans of Justin Beiber who are usually between the ages of 8-12 and female. If you say anything even remotely negative toward Justin they will send you death threats via the Internet, but most of them will not say anything bad when their parents are around. They don't want to get grounded.
Normal functioning human: Justin Beiber's hair looks off
Belieber: WHAT DID YOU SAY YOUR JUST JEALOUS OF MY HUSBAND (he doesn't know it yet but we are married) YOU ARE SO DUMB AND UGL HAHAHAHAHAHA
Belieber: WHAT DID YOU SAY YOUR JUST JEALOUS OF MY HUSBAND (he doesn't know it yet but we are married) YOU ARE SO DUMB AND UGL HAHAHAHAHAHA
by Ligma Cheese September 3, 2018
