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flash mob - 1 dictionary result
Main Entry:  flash mob
Part of Speech:  n
Definition:  a group of people who organize on the Internet and then quickly assemble in a public place, do something bizarre, and disperse; also called inexplicable mob
Example:  Organizing a flash mob involves emailing a group with instructions to show up at a certain place and time to do something and then disappear.
Etymology:  origin was event called Mob Project
Usage:  flash-mobber, flash-mobbing n
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