The 'Aww Yiss' meme stems from a 2010 webcomic by artist Kate Beaton for her series 'Hark! A Vagrant.' The comic depicts a simplified, highly expressive pigeon becoming intensely excited over finding bread crumbs, uttering the now-famous line, 'Aww yiss, motha fuckin bread crumbs.' It quickly became a go-to reaction image across Tumblr, Reddit, and Twitter to represent a state of pure, unbridled satisfaction or anticipation. While the original comic featured a bird, the phrasing has been adapted to countless scenarios where someone finds something mundane—like a favorite snack or a small paycheck—to be incredibly rewarding.