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.

For the most part, it means angry.

1: really or extremely
2: alot

(adj.) an adjective used to enhance a noun.

1. Crazy

2. Angry

3. Extremely, very, a large quantity

New York and New Jersey's way of saying very, it is similar to hella, wicked.

really a lot
crazy good

excessive, numerous.