Seikin is a Japanese YouTuber known for music and comedy videos, and Ai Eki comes from his distinctive vocal style rather than a scripted catchphrase in a film or television show. The clip captures him repeating the short phrase four times, which made it easy to lift, loop and share as a standalone reaction sound. It spread through fan soundboards and short-form video edits, where its brevity and rhythm made it instantly recognisable even to viewers who did not know the original video. That simple, repeatable pattern is why creators still reuse it for quick comedic emphasis.