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1.
urinating. Not to be confused with "taking the piss"
Where's Jeff?

Taking a piss.
by steveh7 September 30, 2009
 
2.
To be essentially fucking with someone or to be condescending to someone by implying that they are stupid.

Refers to when someone says "Don't piss in my pocket and tell me its raining, jerky..."
Tom: "Thanks for the CD, I like rap music.."
Sue: "Are you taking a piss?"
Tom: "No, not at all. I really do like this CD. Thanks
a bunch...really."
by Christophe Graham July 06, 2006
 
3.
Phrase used it the UK to describe the action of taking advantage of the situation, in particular at work. Basically putting the least amount of work possible without getting sacked. The UK English equivalent of mailing it in in US English.
Q: Where is that damn capacity report, Tara should've been done 2 weeks ago?
A: Tara is taking a piss.
by Call Me Ishmael May 25, 2007
 
4.
Phrase used it the UK to describe the action of taking advantage of the situation. The UK English equivalent of "mailing it in" in US English.
Q: Where is that damn capacity report, Tara should've been done 2 weeks ago?
A: I guess Tara is taking a piss.
by Call Me Ishmael May 09, 2007