What is meant by vernacular language?
The “vernacular” is the kind of casual language you might use among your friends and family as opposed to the more formal language you might use at school or work with people you don’t know too well. For example, “We had a good / great time at the fair” would be an example of formal English but “We had a rootin-tootin time at the fair” or “We had crazy fun at the fair” would be examples of vernacular speech. If I were to say “Life would not be the same without our daily morning jolt of java” for a cup of coffee that would be in the vernacular. Vernacular speech often uses idioms, colloquialisms and slang. Hope that helps.