WordWeb Online

1. 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";
   - slang, slang term
    
2. A word or expression that is outside of standard usage and is very informal
   - slang term, slang word

Derived forms: slang expressions

Type of: expression, locution, non-standard speech, saying