The phrase comes from South Park, the long-running animated satire known for putting ordinary characters into absurd encounters with famous and infamous figures. As a short soundboard clip, it spread through reaction videos, meme edits and gaming streams, where its casual tone made it easy to drop over unexpected reveals. It has stayed in rotation because it is instantly recognisable to South Park fans while still working for viewers who only catch the joke: a friendly hello delivered to the last person anyone would expect.