okay so on the first ever episode of grey's anatomy, Omally was picked by Burke to scrub in on a surgery. The interns were betting on how long he could last before he screwed up. He was so nervous, he screwed up and killed the patient. The interns nicknamed him "007" because 00 in agent code means "license to kill"
ETA: pulled that from the web. google rocks my socks. Sara is correct, lol.