A person, usually of an Italian descent, who is generally crabby when things aren't the way they want to go. Usually this person is in a bad mood and chooses not to participate in amusing activities.
Friend #1: I just tried joking around with Mike about something going on right now and he told me to leave him alone and to stop bothering him.
Friend #2: I know right, he did that the other day. Mike is such a Della NoFun.