piss off phrasal verb spoken not polite ( see also ↑ piss )
1 . piss somebody ↔ off to annoy someone very much:
The way she treats me really pisses me off.
2 . British English to go away – used especially to tell someone to go away:
Now piss off and leave me alone!
He pissed off before we got there.
3 . British English used to say no or to refuse to do something