The line comes from JoJo's Bizarre Adventure, where the villain Dio Brando dramatically unmasks himself, translating his Japanese catchphrase 'Kono Dio da!' The English dub of the 2012 anime gave it this exact phrasing, with the actor stretching the final name into the now-iconic 'Diooo.' It became one of the most quoted anime lines online, spawning countless edits and reaction videos, and it now sits alongside the Za Warudo time stop, the To Be Continued arrow and Giorno's Theme as a staple of JoJo meme culture that still shows up in edits today.