The line comes from audio associated with the Birdman House 60KM Competition, where the phrase Big sister, I am completely starving became a short, shareable moment rather than part of a longer scene. Once uploaded to soundboards, it travelled as a reaction clip for hunger jokes, with creators reusing the exact pleading wording because it is easy to recognise in just a few seconds. Its staying power comes from that simplicity: hunger is a universal setup, and the exaggerated delivery turns an everyday complaint into a punchline.