What exactly is slang?
-Using slang means replacing a common word or sentence with a totally new one.
-Slang is the use of informal words and expressions that are not considered standard in the speaker’s dialect or language. Slang is often to be found in areas of the lexicon that refer to things considered taboo. It is also used to identify with one’s peers. WIKI
-A kind of language occurring chiefly in casual and playful speech, made up typically of short-lived coinages and figures of speech that are deliberately used in place of standard terms for added raciness, humor, irreverence, or other effect. Answer.com