Short polite phrases like this became popular on meme soundboards because they can be reused in almost any situation without needing the original context. The thank you sir clip circulates as a generic reaction sound rather than a quote tied to one known film or show, and creators lift it for streams, edits and group chats where a formal reply feels funnier than a casual thanks. Its brevity keeps it easy to drop in, save as an MP3 and replay, which is why similar short voice reactions remain common online.