[n] the everyday speech of the people (as distinguished from literary language)
[n] a characteristic language of a particular group (as among thieves); "they don't speak our lingo"
[adj] being or characteristic of or appropriate to everyday language; "common parlance"; "a vernacular term"; "vernacular speakers"; "the vulgar tongue of the masses"; "the technical and vulgar names for an animal species"
argot, cant, common, informal, jargon, lingo, patois, slang, vulgar
non-standard speech, rhyming slang