Fessi dialect
The Fessi dialect () is a dialect of Moroccan vernacular Arabic, or Darija, associated with the city of Fes, especially with the old elite families of the city. It is considered pre-Hilalian and some of its distinguishing phonological features are the pronunciation of rāʾ ( ر ) as a postalveolar approximant (like the American pronunciation of /ɹ/ in the word "red") instead of a trilled [r] and of qāf ( ق or, traditionally, ڧ ) as a pharyngealized glottal stop or voiceless uvular plosive instead of a voiced velar plosive ([g]). The Fessi dialect has traditionally been regarded as a prestige dialect over other forms of Moroccan Darija, as a function of the historic social and economic power of its speakers. History 
Like other urban Moroccan dialects, it is considered pre-Hilalian. 'Pre-Hilalian' in this context refers to dialects believed to descend from the Arabic spoken in the region prior to the arrival of the Banu Hilal and the Banu Ma'qil tribes that began in the 12th century. After this event, "Hilalian" dialects became dominant in the rural regions of central Morocco and are a major component of wider Moroccan Arabic today. Due to social and demographic changes that started in the 20th century such as mass rural migration into the city and the departure of most of the city's old urban elites to Casablanca, the traditional linguistic features are no longer dominant in the speech of Arabic speakers in Fes today. Jewish Fessi dialect 
The Jewish community in Fes, prior to the departure of most of the city's Jewish residents in the second half of the 20th century, also spoke an Arabic dialect similar to the rest of city. Linguistic features

Phonology 
It has traditionally had distinctive linguistic features, many of which were shared with other pre-Hilalian dialects in the region: on the phonological level, these include the stereotypical use of a postalveolar approximant (like the American pronunciation of /ɹ/ in the word "red") in the place of a trilled [r] for /ر/, or a pharyngealized glottal stop or voiceless uvular plosive in the place of a voiced velar plosive ([g]) for /ق/. Morphosyntax 
On the morphosyntactic level, gender distinction in pronouns and verb inflections is neutralized in the second person singular. Sociolinguistic features 
The Fessi dialect has traditionally been regarded as a prestige dialect over other forms of Moroccan Darija—particularly those seen as rural or 'arūbi ( "of the rural Arabs")—due to its "association with the socio-economic power and dominance that its speakers enjoy at the national level," in the words of Mohammed Errihani. Notes

References 

Moroccan Arabic
Fez, Morocco
Judeo-Arabic languages