Wiktionary
piss and moan
vb. (context idiomatic English) To complain, especially needlessly and loudly.
Usage examples of "piss and moan".
We call it the Disputation Chamber, because this is where we piss and moan.
And there was a lot to be said for such a comfortable port in a storm with an easy lay who wasn't likely to piss and moan about it when a man just had to get it on down the road.