A terrible NHL loss happened January 23, 1944. The Red Wings defeated the Rangers 15-0.

(International circuit) :  Slovakia 82 - Bulgaria 0. (This was played in a pre-qualifying round for the Olympics). 

Thailand holds the title. 92 - 0 in 1998 losing to South Korea in the 1998 Asia-Oceania U18 Championship. (That's about one goal every 40 seconds).