1. [19C+] very fond of, obsessed with, amorous.
2. [late 19C+] (orig. US) crazy, eccentric; esp. in punning phr. nutty as a fruit cake, nutty as a peach orchard boar.
[1910s] (US) a psychiatric institution.
[1910s+] (orig. US) fond of, keen on.
[19C] amorous, fond of, obsessed by.