Douche

A person who is a complete idiot, devoid of any common sense or social skills and has total disregard for the fact that the entire world knows this.

Dave: That jerkoff who sells shit on TV is a complete douche.

Bob: Who, Billy Mays?

Dave: No, that douche is dead, I am talking about that other douche who sells shit on TV.

Bob: Oh, you mean that fucking douche who sells ShamWow.

Dave: Yes, that is the douche I am talking about.