An expensive sports car or similarly overpriced automobile that is driven by an asshole in an attempt to impress others.
> "I don't know why Mr. Peabody feels the need to drive that horrible new rectumobile. He must be going through a mid-life crisis."
> "Gertrude is driving one of those annoying rectumobiles now. Doesn't she realize that everyone thinks she's nothing more than a pathetic old maid with money?"
> "There are so many rectumobiles on the road. It just goes to show how many assholes there are in the world."