Thieves' cant
A SECRET LANGUAGE (CANT) USED BY VARIOUS PEOPLES IN ENGLISH-SPEAKING COUNTRIES
Thieves' Cant; Criminal jargon; Thieve's cant; Rogues' cant; Thieves' argot; Thieves cant; Thieves' Latin; Peddler's French; Rogues cant; Thieves’ cant
Thieves' cant (also known as thieves' argot, rogues' cant, or peddler's French) is a cant, cryptolect, or argot which was formerly used by thieves, beggars, and hustlers of various kinds in Great Britain and to a lesser extent in other English-speaking countries. It is now mostly obsolete and used in literature and fantasy role-playing, although individual terms continue to be used in the criminal subcultures of Britain and the United States.