High Five is an emote unlockable by members using Loyalty points. It is bought from Xuan for 750 loyalty points, but for the first two weeks of its release it only cost 400 Loyalty points. On the third release of the loyalty shop, it was put on special for 375 points.
When this emote is performed the player brings their right hand back, and then throws their palm up and forward through the air. You can use this emote solo, but it is meant to be used with another player who also has this emote for the effect it was intended for.