Dolphin chirps are the natural whistles and clicks dolphins use to communicate, and recordings of them have long been used in documentaries, aquariums and nature programmes to suggest life beneath the surface. Online, short clips of the sound have become a handy shorthand for anything ocean-related, cute or unexpectedly clever, because listeners recognise it instantly even without seeing a dolphin. It also works as a light comic effect, adding a playful animal voice to reactions, memes and short-form videos where a human voice would feel too literal.