antilanguage
Antilanguage refers to a specialized vocabulary and grammar used by a subordinate or deviant group that is in some way opposed to the dominant language of the society. It is not merely slang or jargon, but a systematic linguistic system designed to define and reinforce group identity and to conceal their activities and beliefs from outsiders. The concept was developed by linguist Michael Halliday in the 1970s, who studied its use by criminal gangs.
Antilanguage functions as a form of linguistic opposition. It creates a separate reality for the group, setting
The purpose of antilanguage is often to maintain secrecy, facilitating communication among members without being understood