Ara ara is a familiar Japanese expression often heard in anime, usually spoken by a teasing or older-sister type character, while sayonara is a well-known way of saying goodbye. Combined, the two phrases became a popular reaction sound online, shared on soundboards, Discord servers and short-form video edits where a playful farewell fits the joke. Its appeal comes from that instantly recognisable anime delivery rather than any single scene, which is why creators keep reusing it for exits, jokes and flirty captions long after first hearing it.