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1.
A large group of people that seem to get in the way no matter what angle you attempt to take to get through it. Tends to block main entrances or lobby areas in any type of building.
Todd: Hey man! You were late for our Dad's Make A Difference class at the CC!

Gary: I know dude, there was a giant clustrafuck right outside the main entrance. I was about ready to plow over everyone.
by Mrpissedoffatpeople February 06, 2012