Wiktionary
cat piss
n. (context slang idiomatic English) Any beverage of low quality.
Usage examples of "cat piss".
It's cat piss under the bridge, as we used to say at the old Diogenes Club.
She entered the room where he was lying on an old mattress that smelled of cat piss.
She wrinkled her nose in recollection of the smell of rotting ginger and cat piss.
Personally, Three Oaths thought all champagne tasted like cat piss.