What is the meaning of piss?

noun

• Liquid excretory product.
  • usage: "there was blood in his urine"; "the child had to make water"
  • synonyms: urine, pee, piddle, weewee, water
• Informal terms for urination.
  • usage: "he took a pee"
  • synonyms: peeing, pee, pissing

verb

• Eliminate urine.
  • usage: "Again, the cat had made on the expensive rug"
  • synonyms: make, urinate, piddle, puddle, micturate, pee, pee-pee, make water, relieve oneself, take a leak, spend a penny, wee, wee-wee, pass water