What does Back Pocket Flasher mean?
A paper or cardboard flap attached to the right back pocket of jeans and used to communicate differences in denims, washes, styles and size.
Rawr Denim explains Back Pocket Flasher
This a strategic marketing tool used by denim companies that feature illustrations or graphics that can evoke such themes as Western-style or American 50′s.
Some examples of Back Pocket Flashers: