There is no confirmed film, show or creator behind this clip, so it is best understood as an internet soundboard shout rather than a quote from a known scene. Short, loud vocal bursts like this travel well online because they need no context: anyone hearing the sudden fahhh understands shock or hype instantly, whatever the video shows. On soundboards it sits alongside other reaction screams and is picked up by meme editors who need a fast, high-energy accent for fails, reveals and jump scares. Its simplicity is why it keeps getting reused.