The phrase comes from AOL, the early internet service whose email alert told users a new message had arrived, and it became widely recognised during the 1990s as home internet use grew. The line also gave its name to the 1998 romantic comedy You've Got Mail, which helped fix it in popular culture long after dial-up faded. Online, creators kept the sound alive as a nostalgic shorthand for incoming messages, and louder, boosted versions spread through meme videos and soundboards because the extra volume turns a gentle notification into a joke in itself.