Coucou is a familiar French greeting, similar to saying hey there or peekaboo, and this clip built its life online around that simple, friendly call paired with the name Tobi. Its exact recording source is not widely documented, so it spread mainly as a shareable soundboard clip rather than through a known film or show. The short length and clear name call made it easy to reuse as a greeting, an entrance cue and a light reaction, which is why it keeps circulating in memes and chats.