Top Definition
When one flips their hair in a Justin Bieber (gay) fashion.
Person 1: Flips hair lookin' faggoty

Person 2: Damn, you just had yourself a Bieber Seizure!
by ThePJCommitee November 14, 2010
The act of suddenly singing, talking, acting like, being a fan girl over, or obsessing over Justin Bieber.
I was sitting next to Alia when all of a sudden she started to sing "baby", by Justin Bieber, she was was having a Bieber Seizure.

Alia- "Baby, baby, baby oooooh,"

Valerie-" Bieber Seizure much?"

Alia-" yes... :/"
by Waldo i miss you February 15, 2011
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