This sound comes from Minecraft and is tied to the player character Steve taking damage. It became familiar through years of gameplay videos, challenge runs, livestreams, and meme edits built around recognizable game audio. Creators keep using it because the cue is immediate: viewers understand that something painful, clumsy, or unlucky just happened. In gaming meme culture, it fills a similar reaction role to the ROBLOX oof, but with a Minecraft-specific feel that makes it especially popular in block-game edits and parody compilations.