Informal, chiefly North American; used as a flat adverb meaning "extremely" or "in a crazy manner".
Definitionen
In an extremely enthusiastic, intense, or reckless manner; very. She works crazy hard during finals week.
Used as an exclamation to convey surprise, excitement, or disbelief.
Definitionen
An exclamation expressing amazement, excitement, or disbelief. Crazy! I never thought we'd make it this far.