The term 'How Exciting!' can be expressed in two different ways using crossword solutions. The first solution is 'OOH' which is an expression of surprise or excitement, usually used to express joy or enthusiasm. The second solution is 'OOOH' which is a more emphatic version of the same expression, often used to express greater levels of excitement or joy. Both of these expressions are commonly used to express enthusiasm or excitement in response to something exciting or unexpected.