Wiktionary
up shit creek
a. (context idiomatic English) In trouble; in a difficult situation. alt. (context idiomatic English) In trouble; in a difficult situation.
Usage examples of "up shit creek".
I can see right off we Maloneys are up shit creek without a paddle.
If the car in front turned around for some reason and came back, he was up shit creek without a paddle.
Faced with an out-of-tune, broken-down piano, even the greatest virtuoso is up shit creek without a paddle.
He had been waiting for Underhill, freezing his katookis off and waiting for his only chance to get out of here, and Underhill could have walked right by him while he stood daydreaming, leaving him up shit creek without a paddle.