The phrase 'Not today, Satan' has circulated online for years as a humorous, dramatic way to reject something unwanted, from bad luck and temptation to annoying messages and Monday mornings. It spread through reaction videos, memes, and short-form clips where a single dismissive line could carry an entire joke, and it remains popular because it is instantly understandable even without context. Short versions like this one are especially useful for creators, since the line works as a standalone punchline that fits easily into edits, duets, and storytimes.