The clip is associated with Hikakin, one of Japan's biggest YouTubers, and circulates online under the Hikakin mania meme label. In Japanese, kore da means this is it, with the final koredawa adding an emphatic, feminine tinged flourish that makes the delivery even more theatrical. Short excerpts from Japanese creators are often looped and reposted as reaction sounds outside Japan, and this one spread because the repetition is understandable even without translation. Its frantic build keeps it popular for discovery and reveal edits.
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Japanese voice clip of Hikakin excitedly repeating this is it in Japanese, used as a meme reaction for moments of discovery and sudden realization online.
A young Japanese male voice shouts the same phrase three times in rapid succession, each repetition getting higher and more frantic. The words are koreda, koreda, koredawa, an excited way of saying this is the one. There is no music or background noise, just the raw, close up delivery building from certainty to full celebration. The escalating energy makes a tiny discovery feel huge and funny, which is why the clip lands so well as a punchline. It sounds like pure eureka joy compressed into three seconds.
