Vulgarism
In the study of language and literary style, a vulgarism is an expression or usage considered non-standard or characteristic of uneducated speech or writing. In colloquial or lexical English, "vulgarism" or "vulgarity" may be synonymous with profanity or obscenity, but a linguistic or literary vulgarism encompasses a broader category of perceived fault not confined to scatological or sexual offensiveness. These faults may include errors of pronunciation, misspellings, word malformations, and malapropisms. "Vulgarity" is generally used in the more restricted sense.
Classicism
The English word "vulgarism" derives ultimately from Latin vulgus, "the common people", often as a pejorative meaning "the [unwashed] masses, undifferentiated herd, a mob". In classical studies, Vulgar Latin as the Latin of everyday life is conventionally contrasted to Classical Latin, the literary language exemplified by the "Golden Age" canon (Cicero, Caesar, Vergil, Ovid, among others). This distinction was always an untenable mode of literary criticism, unduly problematizing, for instance, the so-called "Silver Age" novelist Petronius, whose complex and sophisticated prose style in the Satyricon is replete with conversational vulgarisms.