It is when you score nine goals in a hockey game.
No there has never been an ''Ovechtrick'' in the NHL.
Yes, the "ovechtrick" is a real term used in the context of hockey, specifically referring to a player scoring eight goals in a single game. While extremely rare, it has been achieved in the past, with the most notable instance being by Wayne Gretzky in 1985. The term is a play on the word "hat trick," which denotes scoring three goals in a game.