piss on (one's) party(redirected from piss on someone's party)
piss on (one's) party
To ruin, spoil, or undermine one's efforts, plans, or ideas. Sorry to piss on your party, but there's no way that we'll be able to get this done by next week. It's just not possible! It seems as though the court is going to piss on the president's party by ruling that key parts of his proposal are unconstitutional.