When you die, you can use any spin tokens you may have collected in your last attempt in a slot machine. This slot machine is used to win prizes. Every time that you don't win, you make some progress towards this trophy. I wouldn't worry about this trophy as you should have it well before you're finished with other trophies. If not, just collect some spin tokens while playing and grind your way to the 100 losses. To check your progress on this trophy, go to The Stash > My Profile and you must subtract Prizes Won In Final Spin from Tokens Collected to get your loss total. Prizes Won In Final Spin is the eighth statistic under "Totals" and Tokens Collected is the fifth statistic under "Totals".