Most predominantly used in the greater New York area, "mad" is an appropriate replacement for Northern California's "hella" and Boston's "wicked." In the common vernacular, it translates into "a lot" or "extremely." Can be used almost interchangeably with any of the above listed words.
MAD is an American humour magazine with comics. The name should always be capitalized as "MAD" to distinguish with any other Mads or the word (adjective) "mad". MAD is an acronym from "Mesh takes a D", in which "mesh" is "#" (number sign) and "to take a d" is to "commit a suicide".
Bon: "People oftentimes wonder what that "E" in the middle of the name of Alfred E. Neuman – the cover boy of MAD magazine – stands for and what happened to his missing tooth."
Connie: "No, they don't."
Wikipedia says:
A MAD Movie is a Japanese fan-made video, much like an anime music video (AMV), that generally originate from the Japanese website Nico Nico Douga. MAD can also describe the Japanese AMV community, although they can be anything from audio clips, edited pictures, to wholly original creations. MADs do not necessarily even need to be related to anime, though the more popular ones typically are. The term MAD (occasionally M@D) is thought to be a reference to the name of one of the original MADs, rather than a particular acronym for anything.