do or die is a bonus play strategy where you use your entire bankroll placing big bets hoping to hit something significant. When you do, then you grind out the rest of the wagering requirements on smaller bets to secure the profit.
Playing for bonuses Do or Die increases your EV as you will not wager as much because you will be busting out more often than not, but still benefit from the use of the bonus. Many people cannot understand this concept, but it is really quite simple and one of the keys to my success.