argot
A secret language or conventional slang peculiar to thieves, tramps and vagabonds.
Sadie had, in the argot of the day, a really good built.
The specialized informal vocabulary and terminology used between people with special skill in a field, such as between doctors, mathematicians or hackers.
The conversation was in the argot of the trade, full of acronyms and abbreviations that made no sense to the uninitiate.
A strongly marked style of speaking.
Merle spoke in the thin nasal argot of this city's slums: "This the fus toim yez been lobbed, oy, kiddow?"
Where it comes from
Borrowed from French argot, of unknown origin.
Adapted from the Wiktionary entry argot (CC BY-SA 4.0).