The crumbs of various foodstuffs found when the keyboard is turned upside-down, and shaken or banged on the desk. These usually consists of, but are not limited to: Cheez-its, Doritos, sandwich/bread crumbs, dust and hair.
"My God! I just cleaned out my keyboard, and I had enough Keyboard crunchies to feed a third-world nation!"
Prices shown in USD.