- As this phrase may be found offensive, it is often bowdlerised to take the pee or censored in print as “take the p***” or, less commonly, “take the p—”. A common jocular euphemism is extract the urine, a formal equivalent of the literal meaning of the words.
Possibly from piss-proud. Figuratively, to be piss-proud is to have false pride, thus 'taking the piss out of' is to deflate their false pride, usu. through disparagement or mockery. As the piss-proud metaphor became dated, 'taking the piss out of someone' came to refer to disparagement or mockery itself, regardless of the pride of the subject. Eventually the shortened, intransitive form 'taking the piss' became common.