Not a dunderhead, I had no idea either, I had to google...

Park Jae-Sang (Hangul: 박재상; born December 31, 1977) is a South Korean rapper[2], better known by his stage name, Psy (Hangul: 싸이). He is popular for his humorous videos and stage performances, and has appeared on numerous television programs, including Good Sunday: X-Man and The Golden Fishery.


I still have no idea...