
pissen
to piss
Colloquial, vulgar for to urinate.
Ich muss mal kurz pissen gehen.
I need to go piss real quick.
to piss
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to piss
Colloquial, vulgar for to urinate.
Ich muss mal kurz pissen gehen.
I need to go piss real quick.

to piss down
Colloquial, crude for to rain heavily.
Nimm einen Schirm mit, es pisst draußen.
Take an umbrella with you, it's pissing down outside.
The word 'pissen' (to piss) is very colloquial and is perceived as vulgar or crude. Use it only in very informal situations, for example among close friends.
Er fluchte und sagte, er müsse dringend pissen.
He swore and said he urgently needed to piss.
You can tell whether 'pissen' (to piss) means to urinate or to rain from the subject. If a person is the subject, it is about urinating. If 'es' (it) is the subject, it is about heavy rain.
Warte kurz, der Hund muss mal pissen.
Wait a moment, the dog needs to piss.
When 'pissen' (to piss down) means heavy rain, it is always used impersonally with 'es' (it) as the subject. So the structure is always: 'Es pisst.' (It's pissing down.)
Zieh deine Regenjacke an, es pisst schon wieder.
Put on your rain jacket, it's pissing down again.
In the meaning 'urinieren' (to urinate), the verb is often used in fixed phrases such as 'pissen gehen' (to go piss) or 'pissen müssen' (to need to piss).
Wir sollten eine Pause machen, ich muss mal pissen.
We should take a break, I need to piss.
to pee / to drizzle
“Pinkeln” and “pissen” are both colloquial words for urinating. However, “pissen” is considerably more crude and vulgar, while “pinkeln” is informal but less offensive. In a casual, relatively inoffensive statement, “pinkeln” is appropriate; “pissen” conveys deliberately crude wording.

Der Mann schimpfte grob, dass er draußen pissen müsse.
The man crudely complained that he had to piss outside.
Das Kind sagte, dass es vor der langen Fahrt noch pinkeln müsse.
The child said that they still needed to pee before the long journey.