A win-win game is a game which is designed in a way that all participants can profit from it in one way or the other. In conflict resolution a win-win strategy is a conflict resolution process that aims to accommodate all disputants.
Do you feel that someone is continually taking advantage of you? Do you seem to have to fight your corner aggressively, or ally with others, to win the resources you need? Or do you struggle to get what you want from people whose help you need, but over whom you have little direct authority? If so, you may need to brush up your win-win negotiation skills.