The exact origin of this specific 'not today' clip is unclear from the available details, but the phrase is widely used online as a reaction sound. Short refusal audios like this spread well in meme edits because they are easy to understand without context and fit many situations. Creators often use it on TikTok-style clips, gaming edits and everyday reaction videos when a person rejects an offer, avoids a problem or shuts down a joke in a single beat.