You could gamble it all away, but you still owe the money. That is because it is not your money, it is your ex-wife's money.
What if you were to gamble it away when the marriage was falling apart beyond repair but divorce had not been brought up yet?
I'm not a lawyer, but my understanding is that dissipation would then be the issue. (as mentioned above). It would be quite a risk and not very sensible. You would go from giving half of your coins away to giving them all away and still having a bill to pay.