A person or people (Dulltards plural) who is as equally boring as they are stupid.
David Camerom could not remember if he was a follower of West Ham or Aston Villa; what a dulltard.
Stupid, mindless fan of the spanish tennis player Rafael Nadal, who doesn't acknowledge the success of any other player and always finds excuses when he loses a match.
Look at this Dulltard using injury as an excuse for defeat once again