in a troublesome situation. often confused with shit creek ; one is said to be up piss creek without a paddle. unlike shit creek, piss creek should be used in only less serious situations. when possible a paddle is highly reccommend. originally piss creek most likely refered to the mississippi river.
dude 1 "if you're late for work today your gonna be up piss creek without a paddle"
dude 2 "can i borrow your piss paddle, maybe then i won't be so late"
dude 1 "sure, you'd better get paddling, or else tommorrow it'll be shit creek instead".