wingnut

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wingnut

wing·nut

or wing nut  (wĭng′nŭt)
n.
1. A nut with winglike projections for thumb and forefinger leverage in turning. Also called thumbnut.
2. Slang
a. A person with extreme or fanatical political views.
b. A crazy or eccentric person.

[Senses 2a and 2b influenced by wing, faction.]