The act of putting random items in places they simply do not belong for the pure fun and shock factor of victim finding items at a later time.
Raisining, putting salt shakers or silverware from restaurants in purses, depends adult diapers in stranger's shopping carts, BBQ sauce bottles in showers next to shampoo, sunflower seeds in socks, posting of many random images on unsuspecting friend's FB walls, etc.
1. (v) the hobo-utilitarian practice of drying soiled clothing, serving as the highest achievable means of sanitation/hygiene.
Charlie is busy raisining his trousers; but I'm sure he'd love to eat some toast scrapings with you, Mont.