Vernacular

Vernacular is the ordinary, informal, spoken form of language (though possibly written), particularly when perceived as being of lower social status in contrast to standard language, which is more codified, institutional, literary, or formal. More narrowly, a particular variety of a language that meets the lower-status perception, and sometimes even carries social stigma, is also called a vernacular, vernacular dialect, nonstandard dialect, etc. and is typically its speakers' native variety.