The title is Korean, combining byeongsin, a harsh insult for a foolish person, with a Korean phonetic rendering of the English phrase what the fuck. The clip circulates on user soundboards as a compact Korean meme reaction rather than as a widely documented quote from a film or show. Its appeal online is its speed and tone, so it gets reused in short videos, streams and chat contexts where a longer explanation would kill the joke and an instant stunned insult says everything.