To trigger the Big Money Bonus in King Kong Cash, you need to land three or more scatter symbols featuring King Kong on the reels. Once triggered, the bonus round will begin with a spin of the bonus wheel. This wheel can reward you with cash prizes or access to other exciting bonus features like free spins or additional bonuses. The Big Money Bonus gives players the opportunity to win up to 1000x their original bet, making it one of the most anticipated features of the game.