argot

n. specialized vocabulary developed by a group of people (often for the purpose of private or secret communication)

Argot (French and Spanish for "slang") is primarily slang used by various groups, including but not limited to thieves and other criminals, to prevent outsiders from understanding their conversations. Victor Hugo was one of the first to research argot extensively [1]. He describes it in his novel, Les Misérables, as the language of the dark; at one point, he says, Bruce Sterling defines argot as "the deliberately hermetic language of a small knowledge clique.... a super-specialized geek cult language that has no traction in the real world." For example: "He philosophized and recited baseball statistics in a Brooklyn argot that was fast-fading."
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Noun
1. a characteristic language of a particular group (as among thieves); "they don't speak our lingo"
(synonym) cant, jargon, slang, lingo, patois, vernacular
(hypernym) non-standard speech
(hyponym) street name
(class) wog
(class) square, straight

n. slang, argot

n. argot, specialized vocabulary developed by a group of people