Pronunciation: (nuts), [key] Slang.
Also,nerts,nertz.(used to express disgust, defiance, disapproval, despair).
1. insane; crazy.
2. be nuts about,
a. to be extremely or excessively enthusiastic about; be fervent in one's admiration of: Both of them are nuts about chamber music.
b. to be deeply in love with: He's nuts about his new girlfriend.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.