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6.
Making fun of someone, without intending to cause serious offence. Also known as 'pulling the piss'.
Ted: You suck at life.
Jimmy: Screw you!
Ted: Relax, I was just taking the piss.
by Gwai March 22, 2006
 
8.
vb. Medical.

When one is asked to provide a urine sample at a hospital, clinic or doctor's surgery, one hands the jar to a nurse who is said to 'take the piss'.
I had to go to the clinic and the nurse took the piss out of me
by Ben Dover of the Yard September 04, 2004