You know, that term is borrowed from sci-fi. Anybody read Larry Niven? He wrote a bunch of stories about the consequences of cheaply available teleportation booths as a means of transportation. One of the side effects was "flash mobs" and "flash riots" that occured when it became possible for people to step into a booth, dial a set of coordinates and step out of another booth right at the scene of a news story, or a sale, or a restaurant opening, or just about anything. A crowd forms almost instantly(a "flash crowd") and as the crowd grows, word gets out about it, and various troublemakers and pickpockets show up to work the crowd, which quickly degenerates into a mob and then into violence("flash riot"). When things get out of hand, the troublemakers and thieves simply step into a booth and disappear.
The solution that his fictional police found to catch them was to simply institute a program by which they can lock down the area by diverting all outgoing teleports to a central detention area. You step out of the riot into a booth, dial your coordinates, and instead of being home free, you find yourself in a booth where the floor drops open and tumbles you into a slick-sided bowl, where they can fish the rioters out and process them one by one.