Verses with the word piss in the Old Testament (2 verses):

2 Kings 18:27
But Rabshakeh said unto them, Hath my master sent me to thy master, and to thee, to speak these words? hath he not sent me to the men which sit on the wall, that they may eat their own dung, and drink their own piss with you?

Isaiah 36:12
But Rabshakeh said, Hath my master sent me to thy master and to thee to speak these words? hath he not sent me to the men that sit upon the wall, that they may eat their own dung, and drink their own piss with you?