: Indicates this is the first segment of the season or a specific story arc.
: These are likely the names of the websites or "release groups" that uploaded or hosted the file. Takk : This is the title of the series. HDmovie99.Com-Takk.Part.1.Ullu.S01E01-BDmusic99...
The text you provided appears to be a or a torrent string for a specific digital release. Breaking down the tags in the title: : Indicates this is the first segment of