The exact origin of this particular clip is unclear from the available metadata, but the phrase spread online because it fits a classic reaction format: someone assumes the moment is over, then the speaker pushes the bit further. That structure makes it easy to reuse in short-form comedy, meme compilations, and gaming edits. Creators often pair “but I’m not done yet” with abrupt cutbacks, extra receipts, or one more failed attempt, which keeps the line useful even without a widely recognized source attached to it.