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A Cincinnati meteor shower is an antisocial act in which when you take a big sack of shit to the rooftop of a high-story building and then from there you proceed to unload the sack down on an unsuspecting crowd of people, raining the shit down on their heads and causing chaos and humiliation everywhere.

A Cincinnati meteor shower is the most extreme form of a Cincinatti surprise.
The antiwar protestors gasped in horror when they suddenly became the victims of the dreaded Cincinnati Meteor Shower.
by Mark H September 19, 2004
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