The phrase "happy dance" is an idiomatic expression that refers to a joyful, spontaneous and often energetic movement or series of movements performed by someone who is feeling very happy or elated. It can be done alone or with others, and it usually involves clapping hands, jumping up and down, twirling around, waving arms in the air, and sometimes even singing or shouting out loud. The phrase "happy dance" is also used figuratively to describe a celebratory action taken by someone who has achieved something they were striving for, such as winning an award or getting a promotion at work.