There is no official information available about its title, so it has been given a fitting one.
The Kirby Dance is a term used to describe the short dance Kirby does in most of his games usually after accomplishing a certain action (which is usually completing a level or defeating a boss), though the dance itself differs depending on the game, and sometimes there are multiple variations in the same game. Kirby is sometimes joined by two or more other Kirbys (or Helpers/Animal Friends) who mirror or accompany him in his dance.
In Kirby & The Amazing Mirror, Kirby can be joined by up to three differently-colored clones of himself and depending on how many are with him when a boss is defeated, both the dance and the finishing pose will be different.
In Kirby: Canvas Curse, Kirby, who's been transformed into a ball, cannot do the dance himself but rather a group of Kirbys are seen doing it on a sepia-colored screen (with the appearance of an old movie) behind him (on the top screen).
In Kirby: Squeak Squad, the number of Kirbys that do the dance depends on the number of Treasure Chests Kirby has collected in the level: if he collected one Treasure Chest, one Kirby does the dance, if he collected two, two Kirbys do the dance, and finally if three are collected, three Kirbys do the dance.
In Kirby's Return to Dream Land, the Kirby Dance occurs when the bonus game after each level is finished. It is similar to the other dance variations, but with new dance moves added, such as break dancing, the Robot, and the Moonwalk. This is one of the only games to have Meta Knight and King Dedede be able to do the Kirby Dance, with the other being Kirby Star Allies.
In the Super Smash Bros. series
Three variations of the Kirby Dance are used in the Super Smash Bros. games as Kirby's victory pose after winning a match. In Super Smash Bros. Brawl, Kirby's up taunt is also inspired by the Kirby Dance. The traditional music also plays on Kirby's victory screens throughout the series. Starting from Super Smash Bros. Brawl, two versions of the song exist, including a cheerful version that plays on Kirby and King Dedede's victory screens and a metal remix that plays for Meta Knight.