I summarized the terms for idol fans to enjoy live.
Wotagei or otagei refers to a type of dancing and cheering gestures performed by wota, fans of Japanese idol singers, 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 in Japan.
This is behavior to make a gesture or say something during a break in conversation, playing of songs.
Master these things, so you can enjoy idol lives!!