DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   [gammon]
   
   ** English
   
   *** Proper noun
   [en-proper noun]
   
    1. [en]  the Shelta  or Cant  language of the Irish Travelling Community .
   **** Usage notes
   
    - The term _Gammon_  is most widely used by its native speakers in Ireland, but the language is known to the linguistic community as _Shelta_ . _Cant_ , or _the Cant_ , is used by non-native speakers.