Argot
WordNet
noun
(1) A characteristic language of a particular group (as among thieves)
"They don't speak our lingo"
WiktionaryText
Noun
- A secret language or conventional slang peculiar to thieves, tramps, and vagabonds.
- 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.