Kung Lao is a Shaolin monk and longtime Mortal Kombat fighter, recognisable for his razor-edged hat, and this scream comes from Mortal Kombat 9, the 2011 fighting game by NetherRealm Studios that rebooted the series. As clips from the game circulated on soundboards and video edits, the scream became a handy shorthand for dramatic defeat and over-the-top pain. It remains popular because Mortal Kombat fans instantly recognise the voice and the game, while creators can reuse it far beyond fighting game videos.