Eidan

Eidan (英断) is a Japanese slang term to refuse someone’s offer in a humorous and inoffensive way. The word originally means a wise decision, but it is sometimes used to encourage others to stop being stupid among young people.

Takuto: Let’s go to the ramen restaurant, Konshinya now.
Mickey: Now?
Fuga: Wait, can I take an eidan?
Daichi: Come on! We should go there!
Atsuki: Exactly! It’s his birthday party today