If you were up Sh*t Creek, without a paddle, would it not be better to “go with the flow”? One assumes there’s a current in a creek, so the lack of a paddle is less an impediment than in a pond; one may simply wait to come down, were it not likely that Sh*t Creek flows into Sh*t River, perhaps eventually, Sh*t Ocean. In illustrating a predicament, would it not be better to say, “down Sh*t Creek”, implying that one needed to paddle upward? Except of course, that would put us nearer to the source of the poo. Certainly a dilemma, either way, which is perhaps what’s meant.