When something is terrible and bad for you but you can't stop eating it. Derived from "confectionary" and "infectious."
You: I can't stop eating these cheesies man, I've been eating bag after bag.
Me: I know man, their confectious.
confectionery + infectious = confectious. A new word invented to describe choking on laughter following a humourous conversation
Person 1: "omg, steve is dying here!"
Person 2: "Muhahaha, he's confectious!!1"