NSMBU: amazing level clear nuzlock

new super mario bro.s U has had perhaps its best level clear and its a nuzlock.

this player completes the entire level WITHOUT TOUCHING THE GROUND

http://www.destructoid.com/gamer-beats-nsmbu-level-without-touching-the-ground-243761.phtml

What exactly does nuzlock mean? I thought that was a term for the pokemon games.Minishdriveby