Flashmob is short for "flash movie" or "flash mob", a hippie behavior that has recently gained international popularity and can be seen as a form of ephemeral performance art
Simply put, it is a group of people who use the Internet or other means to perform a series of specified songs, dances, or other acts in a designated place at a specified time and then quickly leave. A designated place, at a clearly designated time, unexpectedly and simultaneously do a series of designated songs and dances or other behaviors, and then quickly leave.
"Flash mob" is purely for laughs or worship and commemoration and other performance art, its main characteristics are unorganized, disciplined, only the initiator does not have the organizer, the members are from the network, the members basically do not know each other. It is now blossoming in various forms in China
Expanded Information:
Flash mobs first appeared in New York City in the 2000s, and have since expanded to Europe, Asia and beyond.
The flash mob first originated in March 2000 in Manhattan, New York, USA. At that time, an organizer named Bill called more than 400 people, in New York Times Square, Toys R Us, a pilgrimage to a mechanical dinosaur, 5 minutes after the crowd suddenly and quickly left, flash mob is therefore famous.
The flash mobs are a kind of urban fashion culture, a good-natured joke that modern people play on the world in the midst of their busy schedules. Most of them said they would take part in the event if it was well-designed. Of course, there are some who take a conservative attitude for fear of causing misunderstanding.
Baidu Encyclopedia - Flash Mob