The line comes from JonTron's review of Birdemic: Shock and Terror, the low budget 2010 horror film famous for its stiff acting and crude animated birds. Jon Jafari built the review around reacting in disbelief to scenes like these, and fans clipped his loudest outbursts to reuse elsewhere. This moment survived because the complaint works far beyond the film, becoming a shorthand reaction on forums, streams and edits whenever a sound is grating, badly mixed or simply too much at once.