It looks like you're dealing with a that has a messy, automated filename. Usually, a "proper text" for a video file should be a clean, descriptive title or a short summary of what the content actually is.
Use spaces or dashes instead to make it readable. _-girl-hot-boyfriend-tina-nandi_und_720pmp4
This often stands for "undefined" or "and" (in German). If it's a couple's video, "and" is usually the correct translation. It looks like you're dealing with a that
