Definition of hat tricks:
(n) :
(by extension, sports) Three achievements in a single game, competition, season, etc., such as three consecutive wins.
(n) :
(specifically, ice hockey, soccer) Three goals scored by one player in a game.
(n) :
(cricket) An achievement of a bowler taking three wickets in three consecutive balls.
(n) :
(specifically, rugby) Three tries scored by one player in a game.
(n) :
(specifically, baseball, ironic) The act of striking out three times in a game.
(n) :
(by extension, generally) Three achievements or incidents that occur together, usually within a certain period of time.