That moment when you are listening to you headphones and you can't help but start to play invisible instruments, often accompanied by stage presence enhancing dance moves. Not to be confused with solo synchronized dancing. Flash Jamming is not always done in public but it is always spontaneous. The "jammer" is typically fully aware of the precariousness of his or her behavior but elects to let the beat flow through them and into the minds and hearts of those who are not blessed enough to hear what they are hearing.
Sunday evenings attack on the subway was sparked when a seemingly unaware man began flash jamming to DJ earworm's newest club banger. A group of h8ers, wished they could compete with the coolness of the victim but could not, so they attacked him with makeshift prison shanks.