What does the English slang take a piss mean?

"Take a piss" is a slang term for urinating, or going to the toilet to relieve oneself. It's a very informal and direct way of saying it, and it's generally considered vulgar in most contexts.

Here are some other ways to say the same thing, with varying levels of formality:

* Go to the toilet

* Use the bathroom

* Pee

* Have a wee (British English)

It's important to use the appropriate language depending on the situation and the people you are talking to. "Take a piss" is generally only acceptable among close friends or in very casual settings.