This sound comes from Tai Lung in Kung Fu Panda, the DreamWorks animated film released in 2008. Online, the Portuguese dub line became popular in meme clips and character edits, especially in posts about confidence, revenge, or proving people wrong. It keeps showing up because Tai Lung is one of the most recognizable villains in the film, and the delivery is short, intense, and easy to place over dramatic cuts. It is often used in the same kind of punchline-heavy edits as the bruh meme.