Wiktionary
talk shop
n. A talking shop vb. (context intransitive informal English) To discuss one's work, business or profession.
WordNet
talk shop
v. discuss work-related matters; "As soon as they met, the linguists started to talk shop"
Usage examples of "talk shop".
She did not react as he had hoped, relaxed and ready to talk shop.
It is not his habit to talk shop, and she does not expect to be told anything of his cases till they are over.
It is not his habit to talk shop to his wife, and she is of all women within his experience the least curious.
At the meetings Jube had met a well-known lawyer, a TV weatherman, and a professional exterminator who loved to talk shop and kept giving him cards ('Lots of roaches in Jokertown, I'll bet').