a specialized idiomatic vocabulary peculiar to a particular class or group of people, especially that of an underworld group, devised for private communication and identification: a Restoration play rich in thieves' argot.
2.
the special vocabulary and idiom of a particular profession or social group: sociologists' argot.
Origin: 1855–60; < French, noun derivative of argoter to quarrel, derivative Latin ergōergo with v. suffix -oter
1860, from Fr. argot (17c.) "the jargon of Paris rogues and thieves," earlier "the company of beggars," from M.Fr., "group of beggars," origin unknown. The Eng. equivalent is cant. The Ger. equivalent is Rotwelsch, lit. "Red Welsh," but the first element may be connected with M.H.G. rot "beggar."