The hair flip makes its debut when Michelle performs it during her first A-Troupe audition. It has been performed and referenced several times since then, as recently as Season 4. It is considered to be Michelle's signature move.
Although most people seem to like the hair flip—Michelle has even referred to it as a powerful move that is responsible for getting her to Regionals with the team—Emily has condemned it.
In order to execute the hair flip, one simply stands with their arms extended on either side of them and whips their head in a circular motion. Despite the move's apparent simplicity, it has been said to hurt one's neck.