The 1,000,000 IQ joke comes from gaming and meme slang where an exaggerated IQ number is used to praise, or mock, an unusually clever move. Online it sits close to the galaxy brain meme, which also turns simple thinking into an escalating joke about superior intelligence. Short video editors spread the format because the number alone signals the punchline before anything happens. It stays useful because it works both sincerely for impressive plays and ironically for obvious choices presented as brilliant strategy.