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A very small penis, around 3 inches or less in length and circumference, like Justin Biebers penis.
Girl: "I was gonna give my new boyfriend a blowjob last night, but pulled down his pants and saw that he had a Bieber. I laughed and broke up with him immediately."
Bieber by bieberhasnoballs May 24, 2010
Like a weiner only smaller.

A very small penis.

Named in honour of popular singer Justin Bieber, a small weiner believed by many to have an extremely small penis.
Q: I heard Justin Bieber's weiner is just a bieber. Can that be true?

A: Yes indeed: modern science has shown it to be negligibly small.
bieber by Pipe Downn November 15, 2010
A unit of measurement used to gauge the level of discomfort caused by hemorroids. Each unit is roughly equivalent to the pain and discomfort of watching a Justin Bieber video.
Bieber by Darwin Bonaparte June 25, 2010
Noun:
Something small and insignificant that annoys you greatly.
Verb:
To annoy someone with something small and insignificant.
"That Justin Biebler kid really biebers me."
bieber by Drunk Ex-Pastors November 17, 2014
gay homo squeaky voice small penis no talent weird girls like daniella becci char
whos bieber
bieber by danny skidd April 13, 2010
The worst insult in the history of worst insults!
Guy 1: I just broke up with my girlfriend...

Guy 2: Dude... you're such a Bieber...

Guy 1: Dude... we're done... that was mean, man...
Bieber by Meisamazingbejealous October 11, 2011