Entry 3 senses Webster, 1913

nutty

/nŭt'-ē/ · nut·ty · IPA /ˈnʌti/

01 a. Abounding in nuts.

1.
Abounding in nuts.
2.
Having a flavor like that of nuts; as, nutty wine.
3.
Crazy; insane; loony; batty; nuts.[slang]