The clip's id3 tag reads Ougi full, but its exact source has never been confirmed, so creators treat it as an anonymous anime-style reaction sound. It lives mostly on meme soundboards, where Japanese voice clips with big expressive laughter travel well alongside favorites like Ara Ara. Editors use it the way they use a catchphrase laugh like Bazinga, as shorthand for amused disbelief. Its staying power comes from that single word omoshiroi, which even viewers who do not speak Japanese recognize as a smug, satisfied laugh.