If you can provide any context about where you found this filename, I can try to help you figure out what it actually is.
That phrase appears to be a random string of characters rather than a recognized film, feature, or known video title. It is likely a nonsensical file name, a placeholder, or a typo. If you have more context, such as: Yyyygserensendgbyyyyyyy! mp4
Where you saw this title (e.g., a specific website, folder, or forum)? What type of video it was supposed to be? I can try to help you identify it. If you can provide any context about where