Wotagei

Wotagei or otagei (ヲタ芸 or オタ芸) refers to a type of dancing and cheering gestures performed by wota, fans of Japanese idol singers (and thus seen as Akiba-kei), involving jumping, clapping, arm-waving and chanting slogans. Wotagei is performed at concerts, or at events such as anime and manga conventions and meetings of idol fan groups, and it is thought to have developed from the ōendan, organized cheering squads common at sporting events in Japan.