When a single hockey player has three fights in a single game. Similar to a hat trick in which a player has three goals, or a Gordie Howe hat trick when a player has a goal, and assist, and a fight. Named after the Hanson brothers from the movie Slapshot.
Person 1: Did you see that game last night?
Person 2: Yeah, didn't Jody Shelley fight Bob Probert three times??
Person 1: Yup. Hanson hat trick.