A female from the age of 18 upwards (or in some cases a male) who has an unnatural, creepy and quite frankly unhealthy obsession with canadian singer Justin Bieber. It can also refer to someone who is crazy enough to listen to his music.
Female A: Hey I went out and bought like 10 copies of the new Justin Bieber album.
Rational Thinking Male: You are such a bieberphile
To digitally slow down a familiar but horrible pop song by 800% so that the artist is unrecognizable, but the production and sound quality come forward to create an ambient, zen-like and beautiful sound.
The super-obsession of Justin Bieber and his songs; Knowing the words to all of Justin's songs and everything about him; The impression of having stayed up all night just listening to his songs and waking up in the morning feeling like you're sick.
Girl A: *moans*
Girl B: What's wrong?
Girl A: I stayed up all night listening to Justin Bieber's songs and making a webpage for him.
Girl B: Oh...so you have bieberfever, am I right?
Girl A: Hell yeah!