The phrase blends two familiar Japanese words: nya, the sound of a cat's meow, and arigato, meaning thank you, which is why it fits the playful nya cat girl sound popular in short-form video. On TikTok it has circulated as a cute reaction clip, often attached to anime-inspired edits, cat content and lighthearted thank-you moments rather than to one single show or character. Its charm is simple and instantly readable, so creators keep returning to it whenever they want gratitude to feel sweet, funny and a little bit mischievous at once.