A list of food one has consumed throughout the day, which is provided at the end of an-email regardless of whether it is germane to the body of the e-mail. A zuning is frequently followed by asking, "Is this bad???"
For example, "I've eaten a peach, two Kashi bars, some spaghetti, a barbecue sandwich, and a Jolly Rancher today. Is this bad???"
"Dude, e-mail signatures are so 2006. I just zuning it now."
"I'll be ready in a minute. I just have to put a zuning at the end of this e-mail."