slang slang /ˈslæŋ/

noun

1. A characteristic language of a particular group (as among thieves)  ( cant , lingo , patois , argot , jargon , slang , vernacular )
   a characteristic language of a particular group (as among thieves)
    They don't speak our lingo
   they don't speak our lingo
   
2. Informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar  ( slang , slang expression , slang term )
   informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar
    Their speech was full of slang expressions
   their speech was full of slang expressions
   

verb

1. [Informal] Abuse with coarse language  ( slang [Informal] )
   abuse with coarse language
   
2. [Archaic, Informal] Fool or hoax  ( befool [Archaic] , cod [Informal, British] , fool , dupe , gull , put on , put one across [Informal] , put one over [Informal] , slang [Archaic, Informal] , take in )
   fool or hoax
    The immigrant was duped because he trusted everyone
   The immigrant was duped because he trusted everyone
    You can't fool me!
   You can't fool me!
   
3. [Informal] Use slang or vulgar language  ( slang [Informal] )
   use slang or vulgar language