The everyday language spoken by a people as distinguished from the literary language.
A variety of such everyday language specific to a social group or region: the vernaculars of New York City.
The idiom of a particular trade or profession: in the legal vernacular.
An idiomatic word, phrase, or expression.
The common, nonscientific name of a plant or animal.
"I'm fixing to do that." Meaning, "I am going to do that, without a doubt. But not yet."
Or, even more general,
What is spoken.
Commonly Heard after accidental rhymes or verbose expression:
"Excellent usage (of the vernacular)."
Vernacular is referred to by Truly in Chitty-Chitty Bang-Bang
When Maynard started using words and phrases like 'golly gee,' 'slick as a pig,' and 'poppycock,' we knew he had started using vern-acular.