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1. A phrase used to literally start a game. Is everyone lined up? OK, game on!
2. A phrase used when one is ready to meet or pursue a particular challenge. All right, game on—let's get the cleaning started!
3. A phrase used when one is eager to benefit from a particular situation. I thought I was doing the work for free, but hey, if she wants to pay me, game on!
People say game on to mean that they are ready for something challenging to begin. You think you can beat me? Game on! Note: You can also say it's game on for someone to mean that they are about to face a challenge. It's game on for toy makers as Christmas approaches.
game on1 a signal for play to begin in a game or match. 2 said when you feel that a situation is about to develop in your favour. informal
2 1999 FHM She soon invited me back to her place for the other. Game on!