when you're so bored or so annoyed that your brain literally shuts down for a little nap.
listening to that George W. Bush speech put me into mind-nap mode.
see: borogant
someone who is so boringly arrogant, you can't even laugh at them any longer... you just tune them out for a little mind-nap.
i was out on a date with this guy who was so borogant, i went into an instant coma.