(e.g., a meme, a tutorial, or security footage)?
The inclusion of _source before the .mp4 extension is a major clue. In web development and media processing: 0gurb1wvcdfl48h0x5e08_source.mp4
Take a distinctive screenshot from the video and upload it to Google Lens or Yandex Images . If the video was part of a public post, these engines can often find the original thread. 0gurb1wvcdfl48h0x5e08_source.mp4