Mobilian Jargon (also Mobilian trade language, Mobilian Trade Jargon, Chickasaw–Choctaw trade language, Yamá) was a pidgin used as a lingua franca among Native American groups living along the Gulf of Mexico around the time of European settlement of the region. It was the main language among Indian tribes in this area, mainly Louisiana. There is evidence indicating its existence as early as the late seventeenth to early eighteenth century. The Indian groups that are said to have used it were the Alabama, Apalachee, Biloxi, Chacato, Pakana, Pascagoula, Taensa, Tunica, Caddo, Chickasaw, Choctaw, Chitimacha, Natchez, and Ofo. The name is thought to refer to the Mobile Indians of the central Gulf Coast, but did not originate from this group; Mobilian Jargon is linguistically and grammatically