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1.
derogatory term that is factual, and is therefore not a derogatory term. As a result, it makes the user seem useless.
Bob: Don't be such a wanker.
Ben (in response): Don't be such a piss kidney.
Bob: What? What kind of insult is that. You idiot.

(The phrase originates from the television show Peep Show, series four).
by Sir Rory of Prestonia October 18, 2007
 
2.
Derogatory insult, used in Peep Show by Mark when he couldn't think of anything more appropriately enraging to call a driver when trying to get run over to avoid his wedding to Sophie.
"You're a piss-kidney."
 
3.
A pisskidney, an insult deriving from jizzcock. All cocks are jizz cocks, and in the same way all kidneys are pisskidneys. A poorly constructed insult.
"You bloody Pisskidney!"
by Mark Whalberg Marky Markinson March 11, 2008