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.

Whenever making a congratulatory remark, this is what you say. Made popular by Kamala Harris when she and Joe Biden won the presidency.

A fanbase for the one and only Justin Bieber. The word Belieber comes from Believe and Bieber. Beliebers take up about 86% of Twitter users. Beliebers are the worlds biggest Fandom making up 34% of the World's population. When Justin's twitter account got hacked, the police got 15,000 calls from Beliebers.
A fan knows Selena Gomez.
A Belieber knows Avalanna Routh.
A fan knows Madison Square Garden
A Belieber knows Avon Theatre.
A fan knows Justin Bieber
A Belieber knows Kidrauhl

the most terrifying music fanbase out there

one who is an obsessive fan of justin bieber.

A person who loves Justin Bieber & beliebes in everything that he can do

A fan of and/or believer in Justin Bieber. In case it wasn't obvious, it's a combination of believer and Bieber.