This phrase is a blunt Russian profanity exclamation used in everyday speech for sudden shock, anger or disbelief, which is why it translates so easily into reaction content. On meme soundboards and in short-form video edits it is treated less as a line from a specific show or song and more as a ready-made outburst that anyone can drop over a fail, scare or twist. Its appeal is its immediacy: listeners do not need context to understand the emotion, and its raw delivery makes a short clip feel louder, funnier and more dramatic.