slang

verb

To use or speak in informal, often rude or abusive, language.

"Don't slang off your mates."

noun

Informal words and phrases, often specific to a particular group or context.

"He uses a lot of youth slang."

Thesaurus

Synonyms: dupe, befool, put on, take in, put one across, cod, put one over, fool, gull, vernacular, lingo, patois