Where does “pisse” come from?

pisse (Norwegian Nynorsk) comes from Norwegian Nynorsk pissa, from Old French pissier, from Vulgar Latin pissiare, from Latin pissio — I piss.

pisse (Norwegian Nynorsk): Alternative form of pissa

Definitions

Step	Language	Word	Meaning
1	Norwegian Nynorsk	pissa	to piss, urinate
2	Old French	pissier	to piss; to excrete urine
3	Vulgar Latin	pissiare	present active infinitive of *pīssiō
4	Latin	pissio	I piss