The Red Flag Emoji meme took the internet by storm in late 2021, primarily circulating on Twitter before spreading to Instagram and TikTok. Users post a seemingly harmless statement or a specific behavior they find questionable, followed by a string of the triangular red flag emoji (🚩) to signal a major warning sign or 'deal-breaker.' While the term 'red flag' has long been used in dating and sports contexts, this viral trend turned it into a shorthand for expressing hyperbolic opinions on everything from food preferences to personality traits. It serves as a humorous way to call out niche behaviors that the poster finds unacceptable, making it one of the most versatile and relatable text-based memes in recent history.