A billiards trick shot is a shot that requires a player to use a cue stick to hit the cue ball in a way that causes it to move in an unexpected direction or to hit multiple balls at once. The term 'masse' is used to describe a shot in which the cue ball is struck with a high degree of spin, causing it to curve around an obstacle and hit another ball. This type of shot is often used in trick shots and can be difficult to execute correctly.