shelta

noun

1. a private language, based in part on Irish, used among Travelers in the British Isles.

noun

1. a secret language used by some itinerant tinkers in Ireland and parts of Britain, based on systematically altered Gaelic

n.secret language of Irish tinkers, 1876, of unknown origin. According to OED it mostly consists of Irish or Gaelic words with inversion or arbitrary substitution of initial consonants.