Antiques or jewelry items that have been stolen and hidden away. Chiefly of British usage, a sleeper is an item of antiquity, generally of known provenance, stolen and cached, sometimes for years, until it can be sold to a private buyer or exchanged.
"A sleeper is an item that has been deliberately hidden, usually because it is hot." Lovejoy, "To Sleep No More," 1987.
A contraction of the phrase, "North Korean." Using it is similar in effect to that other derogatory term used against North Koreans, "gook." That term was coined during the Korean War of the 1950s, and later applied to the Vietnamese, has since come to be mean nearly any person or group of Asian descent. Original usage of "nork" unknown, surge in usage noted in mid-2000's, during North Korea's ICBM tests and nuclear plant operation.
"Ace found an article that says flight data shows the Nork ICBM was aimed at Hawaii."