wing nut
noun
variants:
or wingnut \ ˈwiŋ-ˌnət 
\
\
plural wing nuts
or wingnuts
Definition of wing nut
1
usually wing nut
: a nut with wings that provide a grip for the thumb and finger
The wing nut on the handle is tightened to secure the blade in the measured position. — The Home Tool Kit
2
slang
: a mentally unsound person
Ever since his mesmerizing performance as a psychotic cop killer in 1979's The Onion Field, Woods has possessed the image of a driven, angry, over-the-edge wing nut.— Susan Schindehette et al.
3
slang
: one who advocates extreme measures or changes (as in politics)
Many on Cheney's staff see Bush's aides as too liberal, while some Bush aides view the vice-presidential staff as wing nuts.— Nancy Gibbs and Mike Allen Russia proved highly susceptible to the lure of what, in current parlance, would be called wingnuts (fanatics on the far left or right). — The Economist
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