“Flawless Victory” comes from the Mortal Kombat series, where the announcer says it after a round won without taking damage. The phrase became one of the franchise’s most recognizable voice lines, especially from the early arcade era in the 1990s. Outside the games, it spread through machinima, gaming montages and meme edits as shorthand for a perfect result. It is still widely used because the line is instantly understandable even to people who have never played Mortal Kombat.