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A term used by inner-city youth, usually in a gang and oftentimes African-American. Describes a quick, spontaneous shooting (hence 'flash') of an individual (or perhaps of a small group) by a gang of African-Americans (hence 'mob.')

The term 'flash mob' originated as some kind of strange gimmick where net-savvy nerds met in a public place to do something ridiculous, then quickly disperse.

However, 'flash mob' has gone from being something to laugh at to something to fear. Five or six blacks (or occasionally Mexicans, Asians or even white trash) with guns will jump a rival gang member, someone they have beef with, or even a random person, usually in a dark alley or parking lot, shout "flash mob!" and just open fire. A flash mob could also be a drive-by shooting where there are several shooters.
"Flash mob, nigga!" (blast BLAST boom boom POW)
by LL Jonez November 20, 2012
N. - A "flash mob" is a organized event where people gather to do a pre-determined action, in a pre-determined place at a pre-determined time. Usually harmless and funny. Think like massive pilow fights in town centers and things of the like. Usually organized on the internet.

Wanna see? Google Video it...
"Dude, did you hear about the flash mob we're setting up next week?"

"Yeah dude, can't wait!"
by Klink January 23, 2007
Something that internet rookies think that people who use the internet do. Supposedly a "flash mob" is a bunch of random people who meet up to spontaneously do something ridiculous to confuse others.

These don't really exist. When they do, they are carefully organized, which makes them EVENTS... the kinds that people have been having for thousands of years.
Jon: WOW like OH EM GEE we should totally make a flash mob!

Jeff: People don't actually do that.

Jon: Yes they do!

Jeff: Ever seen one?

Jon: ...... OMG have you seen this video of a cat playing the keyboard?
by the lolercoaster December 20, 2011
Flashmobs, group who are likely less than 1 degree of seperation from each other meet up and attempt to get the media to pay attention, before going back to their subversive blogs.

A furniture store was closed and had to be opened by the manager to allow the "spontaneous" flashmob in. He saw the chance for free advertising and got it with TV news.
by bebble September 04, 2003
Where someone texts all the people they know to get a mob together at a certain place and time to do some stuff like trashing a store ect. aqnd those people text other people to do the same thing and they call all the people they know. Once they have done what they came to do they disband just as quickly.
Did you see that flash mob?
by Deep blue 2012 March 30, 2010