ヲタ芸
also: オタげい
Meanings
1
otagei; wotagei; fan dance and chants at idol concerts
A style of synchronized dancing, chanting, and light-stick movements performed by fans (often otaku) at concerts, especially idol group concerts. The term is widely recognized in Japanese pop culture.
At the idol concert, fans performed otagei.
He has perfectly memorized the otagei choreography.