McMansion Trash 

Very similar in behavior to trailer trash...An individual with the outside appearance of successful living (i.e. McMansion or large house, Mercedes in the driveway, trappings, etc)...yet in actuality, conducts his/her life like an animal in the zoo (i.e. heavy substance abuse, extramarital affairs, scandals, slumming, etc.)

Mr. Jones might look successful...but he's really McMANSION TRASH...

McMansion Trash by Graffilthier May 23, 2008