(Noun) - 1) The outing that one partakes in when the desire to consume a Cinnabun becomes so great it can no longer be ignored.
2) A fat person's Saturday night.
Note: Not to be confused with Cinnaruns, which is the massive, runny dumps that occurs after eating too many cinnabuns.
Jayna: Lets go get some cinnabuns. I'm full, but I really want some of that frosting.
Adam: Sure, I'm up for a cinnarun.
Jayna: Oh man, I think I've actually still got the Cinnaruns from last Saturday. Better put a hold on that.