The phrase comes from Duwang, the nickname for a famously rough fan translation of JoJo's Bizarre Adventure Part 4, Diamond is Unbreakable. In that version the town of Morioh was rendered as Duwang, and villain Yoshikage Kira's admiration for his home became the line what a beautiful Duwang. JoJo fans shared screenshots of the awkward translation for years, turning its earnest errors into in-jokes, and the line survived as the most quoted example, reused whenever someone wants to praise a place with mock sincerity.