nutball
noun
nut·ball ˈnət-ˌbȯl 
plural nutballs
chiefly US, informal
: a foolish, eccentric, or crazy person : nut sense 6a, nutcase, nutjob
… to point out that this nutball had no problem obtaining a 9mm semiautomatic handgun.
Stephen King
—often used before another noun Stephen King … Young Doctors in Love, a nutball send-up of surgery and soaps … Lee Wohlfert-Wihlborg
Lee Wohlfert-Wihlborg
Word History
Etymology
nut entry 1 + -ball (as in oddball, screwball entry 1)
First Known Use
1959, in the meaning defined above