noun. A respectful way to address your friendly neighborhood dickhead.
Real citation: "Mr. Joe Penisbrain is going to be let on the streets, then he damn well better realize that he's not alone! I have to do my part to to protect my person and property and family, and more importantly so does the guy behind the controls of vehicle_of_choice. since we can't depend on the guy to be able to safely control his vehichle, the government had damn well better do it for him."
(Aug. 30, 1991, groups.google.com/group/rec.motorcycles/msg/0389356a78167e2b?hl=en&)
Made-up citation: "Why hello, sir. And will Mrs. Joe Penisbrain be joining you tonight?"