The phrase itself comes from a long-standing playground taunt, the sing-song nyah nyah sound children use to gloat after winning a game or getting one over on a friend. Online, short clips of that taunt have become a handy reaction sound because the meaning needs no explanation and the tone stays playful rather than mean. Creators reuse it in gaming videos, prank edits, and short-form comedy whenever they want to rub in a small victory without saying a word, which keeps it instantly recognisable across different audiences and formats.