Slang is an abbreviation of the word Street-Language, taking the "S" from the word Street and "lang" from the word Language. The word "Slang" itself is thus a prime example of Slang, because it's how people on the street refer to "street-language" without pronouncing the entirety of the word. Slang is used to abbreviate and facilitate the pronounciation of formal words and can be used as a lingo which seperates them from people not knowing (a particular) slang.
Relating to or describing anything. This term can be utilized in any situation ranging from a chair to the action of launching a midget. May be used more than once in a sentence, but no more than 17. Dating back to E2 circa 2010.
The colloquial usage of non-standard words, commonly used by "ghetto" and "hip" individuals. Slang is notorious for degrading the quality of a language, but yet also evolves it. In fact, most of the words you and I use were probably not in the first dictionary.
However, slang does not mean to sell drugs. Many think that in Dem Franchize Boyz song "White Tee", they reference drug trafficking using the word "slang" (I bang in my white tee, I slang in my white tee). Rather, slang (verb) mean to front someone by using slang words to insult them, and "bang" referring to gangbanging.