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When you squander a totally awesome chance to win, just because you're too full of yourself and too busy bragging. You end up getting destroyed, and it's all your fault.
I had the lead in the game, but I had to show off and got eliminated.
She had the best chance to pass the test, but she spent the whole time talking about how smart she was.
He had the perfect setup to win the bet, but he kept talking and lost it all.