slang

(noun) informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar. Synonyms: slang expression, slang term. Example: "Their speech was full of slang expressions."

(noun) a characteristic language of a particular group (as among thieves). Synonyms: cant, jargon, lingo, argot, patois, vernacular. Example: "They don't speak our lingo."

(verb) use slang or vulgar language.

(verb) fool or hoax. Synonyms: gull, dupe, befool, cod, fool, put on, take in, put one over, put one across. Examples: "The immigrant was duped because he trusted everyone." "You can't fool me!."

(verb) abuse with coarse language.