PATOIS, a French term strictly confined to the dialect of a district or locality in a country which has a common literary language, often used of the form of a common language as spoken by illiterate or uneducated persons, marked by vulgarisms in pronunciation, grammar, etc. The origin of the word is not certain. It has been taken to be a corruption of patrols, from Low Lat. partriensis, of or belonging to one's palria, or native country, fatherland.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)