Avada Kedavra is the Killing Curse from J. K. Rowling's Harry Potter books and films, the most feared unforgivable curse in the series and usually paired with a flash of green light. Online, the full phrase is often shortened to just Avada and clipped from voice performances, impressions and edits for use as a soundboard button. Its popularity comes from instant recognition among fans, even in a version lasting less than two seconds, which makes it a common shorthand for a magical elimination in memes, edits and reaction videos.