The Patrick Bateman Nodding meme originates from the 2000 cult classic film American Psycho, featuring Christian Bale as the protagonist. In the specific scene, Bateman is seen wearing a clear rain poncho while nodding along to 'It's Hip to Be Square' by Huey Lewis and the News right before performing a violent act. On the internet, this clip has been transformed into a symbol of the 'Sigma' male subculture, representing a stoic, often ironic sense of approval or deep agreement. It is widely used on TikTok and Twitter to react to 'based' opinions, relatable dark humor, or situations where one feels completely in sync with a specific, albeit unhinged, vibe.