'Piss' definitions:

Definition of 'piss'

From: WordNet
noun
Liquid excretory product; "there was blood in his urine"; "the child had to make water" [syn: urine, piss, pee, piddle, weewee, water]
noun
Informal terms for urination; "he took a pee" [syn: peeing, pee, pissing, piss]
verb
Eliminate urine; "Again, the cat had made on the expensive rug" [syn: make, urinate, piddle, puddle, micturate, piss, pee, pee-pee, make water, relieve oneself, take a leak, spend a penny, wee, wee-wee, pass water]

Definition of 'Piss'

From: GCIDE
  • Piss \Piss\ (p[i^]s), v. t. & i. [OE. pissen, F. pisser; akin to It. pisciare, D. & G. pissen, Dan. pisse, Icel. pissa.] To discharge urine, to urinate; -- usually considered vulgar. --Shak. [1913 Webster]

Definition of 'Piss'

From: GCIDE
  • Piss \Piss\, n. Urine. [vulgar] [1913 Webster]
  • take a piss urinate. [vulgar] [PJC]