The specialized informal vocabulary and terminology used between people with special skill in a field, such as between doctors, mathematicians or hackers; a jargon
The conversation was in the argot of the trade, full of acronyms and abbreviations that made no sense to the uninitiate.
An argot is a special language used by a particular group of people, which other people find difficult to understand. the argot of teenagers. footballing argot. expressions used by a particular group of people = jargon