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noun- a sickness, that has recently been becoming more common, where a girl, or boy, is extreamely obsessed with Justin Bieber, and everything related to him. There is no cure found for this yet.
girl- "I don't know what's wrong with me. Lately, all I can think about is Justin Bieber. And every time i hear his name I want to do him even more..."

doctor- "you clearly have a serviere case of Bieber Fever..."
by kaylaxmarie18 April 12, 2010
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The act, or disease of being litterally obsessed with justin bieber. Most commonly found in girls, but occasionally a guy or two
Girl- Dude omgomgomgomgomg i loooooove justin bieber he doesnt know it yet but im gonna marry him!

Guy- Wow... talk about bieber fever
by luluko March 05, 2010
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The act of falling in love with the pop singer Justin Bieber. This condition can affect anyone from the ages of 1 to 92.
You have Bieber fever if you have one or more of the following symptoms:
1. Your heart melts when you see his smile.
2. Your heart flutters when you hear him sing.

3. You think to yourself, "Aww he is the definition of innocence and perfection, he must be an angel."
4. You know the words to at least one of his songs.
5. You find yourself dancing to his music with people around or not.

6. You watch youtube videos of him all day long.
7. You own either My World, My World 2.0....or both.

8. You have bought tickets to his concert(thats an obvious one).
9. You are a 20 year old girl who has secret thoughts of getting with him.

10. You have given him a nickname, such as Biebs, Biebsta,or whatever else you have creatively come up with.

11. You cry because you want to meet him.

12. You think you and him are meant to be (aka marriage)

People....the list goes on and on. Basically you have Bieber fever if you have ANY positive thoughts about the guy.
by Megan Bieber April 21, 2010
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A particularly virulent strain of super AIDS discovered in the late 2000s. Etiologically speaking, it is thought to be transmitted by the vacuous, semen receptacle and proud walking advertisement for abortion that is Canada's own trainwreck, Justin Bieber. Symptoms include:

- In men, the loss of external genitalia, and displays of extreme faggotry are the first signs of the onset of this disease. This is accompanied by trying to dress like the tool (saggy pants that make it look like you just shit yourself anyone?), and using words like "Swag" like a retarded sheep.
- Hemorrhaging of the ears
- Explosive diarrhea
- Projectile vomiting
- Crysturbating in a dark room to Justin Bieber posters and blowup dolls that you shamelessly hide from your parents
- Atrophy of higher cortical structures in the brain. Global signs of dementia and profound mental regression are extremely common in later stages. Critical-thinking faculties are the first thing to go, followed by grammatical processing, spelling, and response inhibition. The loss of response inhibition manifests as Tourette's-like outbursts against anyone who has enough brains to dislike the turd, usually to this other person's amusement. Eventually, the patient's cognitive faculties are all but lost, rendering them zombies.

Other symptoms include everyone who hasn't caught it finding you insufferably obnoxious and wanting nothing to do with you anymore.
There is no known cure for Bieber Fever that results in the patient surviving. The only known way to cure Bieber Fever completely is with a bullet to the head.
by Dr. Snark, PhD December 01, 2013
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Diagnoses: Bieber fever
Symptoms: obsessive thoughts of Justin Bieber, stroke, heart attack, and seizure possibilities if meeting him, crying hysterically, screaming at a shrieking tone, fainting, and falling in love. Falling in love is most likely permanent and irreversible.

If you have heart conditions or medical issues, you should consult with your doctor before watching him on TV, looking at a picture of him, or meeting him in person. It is most common in young girls.

So far this fever is incurable.
20,000 girls show up to Justin Bieber's concert screaming at the top of their lungs and FREAKING OUT. They've got Bieber Fever.
by JustinBieberislife April 16, 2010
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1. A female, or Homosexual Male, who is obsessed with Justin Bieber.

2. A Colloquial term for Dysentery.
John: Dude, I was Playing Organ trail today and died of Bieber Fever.

Jeff: How do you die of Bieber Fever?

John: People die from Dysentery all the time.
by NOPEMAN December 28, 2011
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A very deadly virus that have been diagnosed recently, it is claimed that when a person is infected with the virus (especially a teenage girl, excluding a full grown mature woman), their intelligence and thinking capability will immediately be dropped to 50 IQ or below. Some even rated to be 10 or below.
Infected 1: OMG, HIS SOO CUTE!!!

Infected 2: I KNOW, WOW!!!

Infected 1: <REPEAT>

Infected 2: <REPEAT>

An example of Bieber Fever, the infected is unable to think properly, except their love towards Justin, and is now mentally retarded.
by U MAD? July 15, 2012
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