The phrase is a specific search string used by internet power users to bypass traditional streaming sites and download portals. While it looks like technical jargon, it is actually a "Google Dork"—a specialized search query designed to find open directories on web servers.
Restricts results to pages that include specific text in the browser tab title.
: The Matroska Video container format, highly favored for HD video because it supports multiple audio tracks and subtitles. How Search Engines Find Open Directories
Do you need advice on how to so it doesn't get indexed? Share public link