Wiktionary
piss up a rope
vb. (context idiomatic slang vulgar English) To engage in futile or impossible activity.
Wikipedia
Piss Up a Rope
"Piss Up a Rope" is a song by the band Ween in 1996 from the album 12 Golden Country Greats. It was released on 7" yellow vinyl single on Diesel Only Records.
Usage examples of "piss up a rope".
I told him to leave you the hell alone, and he told me to piss up a rope.
When those were over, they pulled my scholarship and told me to go piss up a rope.
Lieutenant or no lieutenant, Les was ready to tell him to piss up a rope if he said yes to that.
If you know anything, you know how I felt about Korff and-and you can go piss up a rope, mate,”.
Ossian had been forgotten, and music too, and perhaps also a son who had possessed the audacity to tell old Father Lynch to go piss up a rope.