The phrase comes from Dwayne 'The Rock' Johnson's WWE wrestling promos, where he used 'It doesn't matter' to brush off opponents and crowds during his rise as one of the company's biggest stars in the late 1990s. The line became a signature part of his confident, trash-talking persona and was repeated in countless matches, interviews and highlight reels. As wrestling clips moved onto YouTube and social media, the short dismissal was lifted for reaction videos and memes, and it remains popular because it instantly signals finality, confidence and playful disrespect.