The name given to someone with a particularly blockish head, whether it be due to a particularly BAD haircut or the general shape of their head. Originating from the form the head takes when this condition sets in, sufferers of this syndrome face much ridicule and jocularity from the general public at large.
"Dear Lord! It's Big Square D! Flee!!"
"You know, Big Square D! AKA Richard Dalrymple?"