Slang [BE]

A slang is a vocabulary (words, phrases, and linguistic usages) of an informal register, common in verbal conversation but avoided in formal writing. It also sometimes refers to the language generally exclusive to the members of particular in-groups in order to establish group identity, exclude outsiders, or both. The word itself came about in the 18th century and has been defined in multiple ways since its conception.
In its earliest attested use (1756), the word slang referred to the vocabulary... plus