Anyone know?

not my jargon. ;-)

jpeg, do you mean extract the urine as in abuse hospitality, friendship, take advantage of, or do you mean as in joking, pulling someone's leg, just kidding?

Something like ล้อเล่นป่ะวะ

As with "taking the piss" in English, you would only use this term with people you are friends with.

What does it mean anyway? Is this an expression used in the UK. I think I've heard Gordon Ramsay say it.

It means two things- it can either me to tease or ridicule someone- "We were just taking the piss out of him."

Or it can mean to take liberties with someone, or to be unreasonable. Which would be the Gordon Ramsay version- "You expect me to eat this? You're taking the piss."

"They expected me to pay extra because I'm a foreigner! They're taking the piss."

It means two things- it can either me to tease or ridicule someone- "We were just taking the piss out of him."

Or it can mean to take liberties with someone, or to be unreasonable. Which would be the Gordon Ramsay version- "You expect me to eat this? You're taking the piss."

"They expected me to pay extra because I'm a foreigner! They're taking the piss."

Thanks!