Pretty cool expression. Where from? A book titled "Stiff".
Picture me wookiepedia-surfing: from Mythbusters to Dirty Jobs to Body Farms in about 20 minutes. The article on Body Farms links to a two-page excerpt from "Stiff: The Curious Lives of Human Cadavers" by Mary Roach. A very interesting read indeed.
Parting gem, for the squeamish:
"If you lower your head to within a foot or two of an infested corpse (and this I truly don't recommend) you can hear them feeding. Arpad pinpoints the sound: 'Rice Krispies.'"