Merriam-Webster Dictionary:
* 1: very informal language
* 2: the special vocabulary of a particular group (as the underworld, a profession, or a region)
Oxford English Dictionary:
* 1: Informal language, especially a kind used by a particular group of people.
* 2: Informal words or expressions that are not standard in the language.
Cambridge Dictionary:
* 1: very informal language that is usually used by a particular group of people, such as young people or those with a particular job or interest.
* 2: words and phrases that are used in informal situations.
Overall, slang is considered informal language, often used by a specific group, and sometimes with a slightly different meaning than its standard usage.
Here are some key points to remember about slang:
* Context-dependent: Slang can change quickly and can be specific to a time period, region, or group.
* Informal: Slang is generally considered inappropriate for formal writing or speaking.
* Evolving: Slang is constantly changing and new words are being added all the time.