Justin Bieber obsessive chick fan base of Beliebers turning into high pitched screaming unstoppable zombies.
Activities include : pushing people out of the way, running, screaming, screeching, clawing, pulling hair, crying, running into and across traffic, possibly breaking windows, climbing just about everything to get close enough to Justin Bieber, yelling "I LOVE YOU JUSTIN" and sadly much more...
Me: "Omg! Look at those Biebitches go! Justin's gonna get trampled on!"
Friend: *grabs popcorn* "Let's watch!"