Loool comes from internet slang where adding extra o's to lol signals laughing harder than a plain lol ever could. The spelling spread through gaming chats, forums and meme pages in the 2000s and 2010s, and short voice clips mimicking that drawn out laugh followed on soundboards and social apps. Because the joke needs no context or setup, creators reuse it across platforms as a universal reaction. It survives because text laughter translated to audio still reads instantly, even in a one second clip.