The line comes from Step Brothers, the 2008 comedy directed by Adam McKay starring Will Ferrell and John C. Reilly as two middle-aged stepbrothers forced to live together. Derek, played by Adam Scott, is Brennan's successful younger brother whose smug perfection fuels much of the film's jealousy-driven humor. Short clips of the film's insults have circulated for years on soundboards and meme pages, where this two-and-a-half-second jab is reused as a quick teasing reaction. Its staying power comes from the film's cult rewatch value and the universal fun of cutting down a show-off.