What Does Slang Mean? Slang is the language we speak in everyday life , slang is informal language What Is Slang? Slang is like broken english. Example, "What-up homie?, instead of "what's up my friend?.Or "Aight, I'll holla back"; instead of "ok, I'll see you later". Is Ain't A Slang? Yes,it is slang for isn't. What Does Holla Means In American Slang? Give a call to someone