Definition from Wiktionary, the free dictionary
nutball (plural nutballs)
- (informal) A crazy person.
1990 February 23, Glenn Garvin, “Postcards From a Lost War”, in Chicago Reader:
- Hull was much less of a nutball than most of them, and the CIA station chief started coming around more and more often.
2008 March 22, Timothy Egan, “Donner Party Democrats”, in New York Times:
- One of their leaders had been hanging around the camp of another preacher man, the Rev. Jeremiah Wright Jr. a nutball like Robertson, blaming America for bringing on the horrid attack.
- See also Wikisaurus:mad person.