Thinking strategically about your profile - it's that final piece of the puzzle the other questions dont seem to ask/answer
For example, if in all the other essays all you've talked about are your leadership abilities or communication skills, and there's something else you haven't managed to speak about such as your drive, this is the opportunity.
Rephrase the question dude, like on the GMAT - "Answer a question you wish we'd asked" = "Tell me something about yourself that isn't apparent in your essays or your applications"
wannabe business school consultant