The term 'What's the Big Idea!?' can be answered with three words: 'HEY, ' 'THEORY, ' and 'Masterplan.' The word 'HEY' is an informal greeting used to get someone's attention. 'THEORY' is a set of ideas or principles that explain how something works or why something happens. Finally, 'Masterplan' is a comprehensive plan or strategy for achieving a goal. Together, these three words suggest that the big idea is to have a comprehensive plan or strategy in place to achieve a goal.