same as the word stupid, only dumber! Beyond stupid. Yes, it's bad grammar but it so fits some insane circumstances.
The more high tech gadgets people use, the stupider they get. Like when certain behavior is acceptable (public cell phone use in a theater for example) Rather than turning off the phone people have gotten stupider and think the world revolves around them. Thus they will answer the phone and talk on it while others sit there horrified at their uncouth behavior.