nutso
1 of 2adjective
nut·so ˈnət-(ˌ)sō 
chiefly US, informal
: insane, crazy
It's a nutso plan, but it might just work.
Months later, midtrial, Davis suddenly comes clean about the dope and the booze. Turned him into a monster, he says. Made him nutso …
Carl Hiaasen
Carl Hiaasen… guarantees that you make time for each other, no matter how nutso your lives become. Michele Bender
Michele Bendernutso
2 of 2noun
plural nutsos
chiefly US, informal
: a crazy person : nut
Research suggests that sports fans are better adjusted, socially and emotionally, than the general population. This might seem implausible to anyone who's turned on the game and seen beery, bare-chested nutsos baying into the camera lens, their bodies painted in team colors like totem poles. Mike Hendricks
Mike Hendricks
Word History
First Known Use
Adjective
1941, in the meaning defined above
Noun
1961, in the meaning defined above