Dokidoki is a Japanese word for a pounding, fluttering heartbeat, often used to describe excitement or nervousness, and this clip pairs that feeling with Hikakin's exaggerated delivery. Hikakin is a long-running Japanese YouTuber known for beatboxing and energetic reaction videos, and short exclamations from his content are frequently clipped and shared as memes. This one spread through Japanese meme and soundboard communities because its rising tone is easy to recognise, easy to reuse, and works even without translation, keeping it popular for reaction and anticipation edits.