(idol fandom) activity in support of one's favorite idol

(idol fandom) to engage in activity in support of one's favorite idol

(quiz competition) pressing a buzzer early in the hope that the person reading the question is incapable of stopping immediately

(idol fandom) A drinking glass on which the name of an idol is lettered. It can be shown off on social media, often accompanied by a drink in the same color as the idol's designated color (メンカラ).

disciple

御城, お城: honorific form of 城 (shiro, “castle”)

後ろ: (now rare, dialectal, Iwate, Hachijō, Kansai, Shikoku, Izumo, etc.) Nonstandard form of 後ろ (ushiro, “back, behind, rear”).

pressing quickly

押し寿司: oshizushi

鮴押し屋: arm-twister