The 'American Psycho Arm Flex' meme stems from a scene in the 2000 cult classic film American Psycho, where the protagonist, Patrick Bateman, stares intensely at his own physique in a mirror during an intimate encounter. This moment perfectly encapsulates Bateman's extreme narcissism and obsession with self-image over human connection. In internet culture, the scene gained massive traction within the 'Sigma Male' and 'Literally Me' subcultures, often used to humorously portray excessive self-admiration or the feeling of pride after a minor achievement. It serves as a visual shorthand for vanity, confidence, and the absurd lengths of ego-driven behavior.