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What is a "code black" in an emergency room in a hospital (in medical terms)?

Grey's Anatomy is showing an episode tonight that advertises a code black and I have no idea what it is, and would like to know. Althgough I have never even watched the show, it would be nice to know what it is from a medical professional/expert or someone who at least has an idea what it could be besides a guesser before I watch it. I think it airs tonight at 8 central time. I am in central time. If anyone knows exactly what it is, feel free to respond. Thanks guys!

Public Comments

1. A code black is a bomb threat.
2. a bomb threat
3. http://popwatch.ew.com/popwatch/2006/01/what_the_heck_i.html
4. It's usually a bomb, but it can mean severe weather
5. It means there is an unauthorized black person in the hospital; "code white" means an unauthorized Caucasian; "code yellow" means an unauthorized Asian, and "code red" means an unathorized Native American. Incidentally, "code blue" means that Smurfs have taken over the hospital.
6. It could mean anything. Depends on the facility. Where I worked, it meant severe weather, like a tornado.
7. I agree with jesslb, it could mean different things in different facilities. I guess you could ask personnel in your local hospital what it means in their hospital.
8. Black = Bomb Threat Brown = Severe Weather Blue = Patient is coding Orange = Patient/Guest is violent etc...