The sales clerk is 'pissing' us 'around' [=('US') 'jerking us around']—he keeps saying he'll help us, but we've been waiting for 20 minutes!
He says he has to 'take a piss'. = ('Brit') He says he has to 'have a piss'.
It's time we stopped 'pissing about' [='fooling around'] and got busy.
(..) come to my house with robot eyes... and they tell me to try them on... I'm gonna tell those scientists to piss off, because... because Gus, I don't even want to see a world without you. I don't. I don't want to see a world without Augustus Waters. (..)2014 The Fault in Our Stars
(..) Oh. BRUTAL: Paul? Prisoner. Christ, give me a minute. You all right in there? For a man pissing razorblades, yeah. Ahh... You should've took the day off to see the doctor. With a new arrival? You know better. (..)1999 The Green Mile
(..) Percy... ...something to say? I didn't know the sponge is supposed to be wet. How many years you spend pissing on a toilet seat... ...before someone told you to put it up? - Percy fucked up, Hal. Pure and simple. That's your official position? Don't you think it should be? (..)1999 The Green Mile