Unlike a catchphrase from a film or show, this clip has no single viral origin; it is a straightforward animal sound effect that creators reuse because hippos are instantly recognisable and unexpectedly loud. On TikTok and in short-form edits, animal grunts are often used as reaction sounds, giving a human moment an animal voice for comic effect. Its appeal is simple and lasting: the grunt is short, punchy and easy to drop into almost any funny clip without explaining the joke.