Many years ago, Polaroid prints used to come out of the camera in a two-part sandwich, with the positive print sticking to the negative. The two parts were peeled apart. Often, a little polymer, an agent used to transfer the negative to the positive print, stuck to the positive print.
Photographers often waved the print in order to dry off the tacky polymer, in the mistaken belief that the photograph would develop sooner. Now Polaroid uses "integral film," so that the print comes out of the rollers in a self-contained unit, so that the exposed print isn't moist.
Flapping the print around does nothing except kill time until the photo is developed.
http://en.wikipedia.org/wiki/polaroid_corporation
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