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nut·so | \ ˈnət-(ˌ)sō 
\
\Definition of nutso
(Entry 1 of 2)
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 … guarantees that you make time for each other, no matter how nutso your lives become.— Michele Bender
nutso
noun plural nutsos
Definition of nutso (Entry 2 of 2)
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
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Time Traveler for nutso
The first known use of nutso was in 1941
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