Stands for Crazy Ass Cunt or Crazy-Ass Cunt.
C.A.C. is a coded epithet used on social networking sites to protect children and the general public from open profanity.
Synonyms: bitch, cunt, minger
Antonyms: angel, doll, sweetie
Hey, j-money, can you chill my CAC under that umbrella for a bit?
Sure, I'd love an ice cold CAC.