Top Definition
It's a syndrome where little girls vigorously defend fellow "singer" Justin Bieber and say that he is "the best musician in the world". Along with that claim, most Bieber fans hate rock and metal music, and say that rock 'n roll/metal is music for "devil worshipers".

Most Justin Bieber fans also like: The Jonas Brothers, Naked Brothers Band, Tokio Hotel, Miley Cyrus, Selena Gomez, Taylor Swift, Lady Gaga, Soulja Boy, just to name a few other untalented "musicians".
Justin Bieber fan: OMG JUSTIN IS NO EFFIN HOT I SO WANNA MEET HIM N GIT HIZ AUTAGRAFFFFFFF
Me: You have the Justin Bieber Syndrome...
Justin Bieber fan: NO I DONT!! I JUST GOT MILLIONS OF PICS OF HIM IN MY ROOM AND I HAVE ALL HIS SONGS ON MY IPOD!!!
Me: Precisely.
#justin #bieber #singer #kid #pubescent #syndrome
by JustinBiebersucks June 17, 2010
An extremely cruel way to say Down's Syndrome
Guy 1: That girl has Justin Bieber Syndrome.

Guy2: Hey, don't be cruel. Be nice, and call it Down's Syndrome.
#justin bieber #justin bieber syndrome #justin beiber #justin beiber syndrome #down's syndrome #downs syndrome #cruel
by Marty17 February 25, 2011
A condition that prevents hormonal growth and development until age 18 or older.
I think this guy has Justin Bieber Syndrome. His voice probably won't change until he's a full adult.
#puberty #voice #hormones #small #singer
by C1pt5n A6es3me May 04, 2015
When a person hates on something for no other reason than just to “go with the flow”.

This is a recent phenomenon which has affected people of all ages. It represents the ultimate in conformity. Anyone with any brains can see that people who suffer from this illness are really sad and should be pitied.
Guy 1: (trying to impress nearby hot girl) That Justin Bieber kid is such a fag! I just wana strangle his head off!

Guy 2: Totally dude, like seriously, word dawg. What do you think Guy 3?

Guy 3: (ignores the other two and talks to the hot girl) These guys have the justin bieber syndrome, don't mind them. You want to get a bite to eat?

Hot Girl: Sure, anything to get away from these two losers.
#justin #bieber #boy #girl #lame #cool #conformity
by Smokingisfun February 08, 2011
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