M7 arrived without a documented origin, which is common for user-generated soundboard uploads: short clips get renamed, trimmed and reposted until the original context disappears. The label is likely just a file or button name rather than a reference to a show, song or meme. Even so, the format fits how tiny sounds travel online. People keep it because it is easy to place, easy to share and flexible enough for memes, edits, streams and group chats.