noun. A talker whose buttmunchitude is roughly equivalent to a box of rocks. Or a bag of stones. Or a carton of milk. Or an underachieving gazebo.
Real citation: "'This segment sponsored by Toyota--moving forward'
SOB! Write a couple of dumb illogical ant-GM articles and become a celebrity, see your booksales improve and become the spokesdumbass for all things green and anti-GM."
(June 19, 2006, GM Inside News Forum, http://www.gminsidenews.com/forums/f12/discovery-times-addicted-oil-more-gm-bashing-32974/)
Made-up citation: "I'm thinking of hiring a spokesdumbass. I'll look smart by comparison, and I can lay off the spokesnutjob, who gets on the nerves and wires of my favorite: the shiny and melodious spokesfembot."