The string you're looking at is not a single phrase but a shorthand used on torrent and piracy websites. Each part describes a specific feature of the file:
Stands for "Web Download." This means the file was losslessly ripped directly from an official streaming service (in this case, Ullu) without re-encoding the original broadcast stream, preserving clean visual quality free of on-screen television logos. paro 2021 webdl 600mb hindi s01 ullu 720p
Confirms that the audio track is in the original Hindi language. Risks Associated with Unofficial Streaming and Downloads The string you're looking at is not a