The phrase itself is a long standing Russian expression meaning you should be able to recognise your enemy on sight, and the transliteration vraga nado znat v litso is how many non Russian speakers search for it. As a short voice clip it spread through meme edits and soundboards, where the stern delivery is borrowed for comic identification moments. It remains popular because the meaning is clear from tone alone, so creators can drop it over games, sports rivals, pets or friends and the joke lands without extra explanation or context needed for first time viewers.