Ni hao is the Mandarin greeting for hello, while nyan is the Japanese onomatopoeia for a cat's meow, and combining them turns a simple greeting into a playful, cross-cultural meme sound. Short clips like this circulate on soundboards, social video apps and anime fan edits, where creators use them as quick character greetings, stream intros and reaction cues. Its appeal is simple: the phrase is easy to recognise even without knowing either language, and the cute, sing-song delivery makes it reusable across cute, funny and wholesome edits.