I know what it means, but it's a very very difficult idiom to explain, even in spanish.
It's an interjection. Like ¡Dios mío! ¡Vaya por Dios! and such. It's used in colloquial situations, and has the connotation of doubt about what will you do in the future, or what will happen.
The most similar idioms in spanish I can find are: ¡Lo que nos espera! or ¡Lo que se nos viene encima!
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