wingnut noun a person who is easily angered or flustered US As a piece of hardware, a “wingnut” is easily tightened–the basis for its application to a person.
So, all things considered, this wingnut sitting across the desk today wasn’t all that bad. — Seth Morgan, Homeboy, p. 193, 1990
I don’t want you to get ripped off by a couple of baby-starved wingnuts. — Juno, 2007