The gnu, or wildebeest, is a large African antelope famous for its loud, nasal grunting calls, especially heard during the Great Migration in the Serengeti. Those short bellows have long been used in nature documentaries and stock sound libraries to signal a herd nearby. Online, editors lifted the isolated call away from the wildlife context and began using it as a standalone punchline sound, sharing it on soundboards for quick animal reactions, memes, and joke edits where a sudden grunt says more than words.