My sister found this one – thanks, Susan! Follow the link for the explanation.
ultracrepidarian
ultracrepidarian: a person who criticizes, judges, or gives advice outside the area of his or her expertise.
ultracrepidarian: a person who criticizes, judges, or gives advice outside the area of his or her expertise.
My sister found this one – thanks, Susan! Follow the link for the explanation.
via 
ultracrepidarian 