Blow up in (one's) face informal verb phrase common
To abruptly explode or blow up.
The bomb blew up in her face in a crowded street.
The artillery shell blew up in people's face and injured several people.
Used to say that a plan goes wrong or awry.
I regret to inform that all our plans blew up in our face.
My plan blew up in my face mainly due to a lack of finance.
A humorous way of saying that what one has said is just what they acknowledge and may not be entirely accurate
Mike: Have you returned from your vacation on the beach? Your skin seems to get tanned.
Jenny: My skin is always dark. That's my story and I'm sticking to it!