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Made up on twitter, it is a type of orgasm people get when they see teen popstar sensation Justin Bieber. Justin may even get these himself time to time.
Justin Bieber Fan #1: OMG! Justin looks sooo hot here!! :0

Justin Bieber Fan #2: It looks like he's having a biebergasm! mmmm.
by Belieber December 20, 2009
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3
when every girl at a justin bieber concert simultainiusly have an orgasm when he starts singing
Dude: did you see the biebergasm last night?
Guy: ya i got a major stiffer
Dude: i think justin had one himself
by bootyfreak January 21, 2010
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5
A sexual erousment you get when you see or hear teen pop sensation " Justin Bieber "
Bieber Fan No.1 : oh my god he's so hot!
Bieber Fan No.2 : oh i know, i hink i just had a biebergasm!
by JBFanClubX January 10, 2010
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6
when you see justin bieber, he is SO hot and you are so overwhelmed you have some kind of an orgasm, except its completely justin bieber-ish. :)
girl: ..and this pic is of paris hilton
other girl: cool
girl: and this is of..OMG, justin bieber!
other girl: omg omg omg hes so hot, *sighh*
girl: i TOTALLY just had a biebergasm
other girl: same. here.
by RoRogirrrllllyyyyyyyy yes. October 28, 2010
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