The line comes from internet meme culture rather than a single film or television show, where the step bro setup became a widely recognised joke about awkward, staged encounters. It spread through short-form videos, reaction edits and soundboards, where creators reused the short spoken phrase to signal that a scene was about to turn awkward or suggestive. Its staying power comes from that instant recognition: even without context, listeners understand the joke, which makes it an easy shorthand for playful, slightly risqué humour in memes and comedy edits.