also: オタげい
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.
Standard spelling using ヲタ (otaku) and 芸 (performance).
Variant spelling using オタ; both forms are seen, but ヲタ芸 is more common in fan communities.
Compound of ヲタ (a variant spelling of オタク, 'otaku') and 芸 (げい, 'performance, art'). The term emerged in the late 1990s or early 2000s within Japanese idol fan culture to describe the energetic, choreographed cheering routines.