Blow up in somebody’s face
Definition 1 of 2
Pro Tip 1/3Negative Outcome
The phrase implies a failed result, often unexpectedly and with negative consequences. 
The surprise party blew up in his face when the guest of honor arrived early.
Pro Tip 2/3Emotional Impact
The phrase can express frustration or dismay due to plans going wrong. 
Her elaborate proposal blew up in her face, leaving her devastated.
Pro Tip 3/3Consequences
It's often used when there are significant consequences to the failure. 
His dishonesty about his credentials finally blew up in his face during the interview.
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