antilanguage
n. A collection of words and phrases used to exclude outsiders from a particular group and to disguise the group‘s activities.

Example Citations:
Mobspeak is a language that grows out of secrecy, and who can be more secret than the Mafia? The anti-social nature of the Mob is the perfect breeding ground for an “Antilanguage.“
—Bryan McLucas, “Mobspeak: The Language of the Mafia“,> University of Georgia, March 17, 1997

The history of laani shows an important and — I think — well-used, underground trail for a significant number of South African neologisms, in English and other languages. The trail starts with class relations of the old Cape and the Afrikaans working-class codes of people of colour; it then proceeds north to the Witwatersrand and is absorbed into the predominantly black forms of township slang and antilanguage.
—Raj Mesthrie, “Lexicography from below,“ Studia Anglica Posnaniensia: international review of English Studies, January 1, 1997

Earliest Citation:
Anthony Burgess reviewing The Language of the Teenage Revolution by Kenneth Hudson in The London Observer:

“The language of the young is thus really an ‘anti-language‘ — defined as ‘the special language of people who choose to be outside society.‘“
—“Secret language,“ The Globe and Mail (Canada), July 23, 1983

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