to talk shop (to talk about work or business outside the office)
A: I’m really worried about the meeting on Monday morning. Do you think the management team will be angry about the sales figures?
B: Stop talking shop! We came to this party to relax and to forget about work!
A: Yeah, sorry. I just can’t stop worrying about it.
A: I really don’t like going out for a drink with people from the office. After a few minutes, everyone starts talking shop.
B: Well, I think that’s normal when you go out with work colleagues.
A: I know. But I wish people could stop talking shop and talk about other things, like holidays or movies!