1. A piece of food that is yarfed up (vomited up violently and vocally) and still discernible in its identity.
2. A perfectly reasonable substitute for "asshole" or "wuss."
1. "Y'know... that yarf nugget kind of looks like my chicken satay. For the last time, stop stealing my food outta the fridge!"
2. "Quit being a fuckin' yarf nugget and get me the sledgehammer. Did you want cow for dinner or what?"