: This is likely the "handle" or "username" of the group, channel, or individual who encoded or uploaded the file. In many online communities (such as Telegram or file-sharing forums), uploaders tag their files with their name to build a brand or help users find more of their content.
The text appears to be a specific filename or a digital signature used by a content provider, likely related to movie or media distribution. Based on the structure of the text, @BollyWeeBHolly 480p.Mkv
: This indicates the video resolution (Standard Definition). It means the video has a vertical resolution of 480 pixels, which is a common balance between decent visual quality and a smaller file size for easier downloading. : This is likely the "handle" or "username"