Undigested Red Meat

Just the other decade I was watching a movie in which a character stated that the average male has four pounds of undigested red meat in his bowels at all times. Now this got me thinking. Why is the meat undigested? And why does the body set aside four pounds of it not to digest? How does it keep it fresh? Is it stored in a special meat sack for emergencies, like when your significant other goes on a weird vegetarian diet and you end up eating dinners consisting of bean sprouts on a bed of sawdust and carbon nanotubles? I think I'll have to send an e-mail to P.Z. Myers, the biologist. He's an expert on squids and pirates, so if anyone could explain the mysteries of the meat sack to me it would be him.

Of course, Australian researchers have long known about the existence of the carrot sack, which can store carrots for years after you've eaten them.