wingnut
A deciduous tree of the genus Pterocarya native to Asia.
Alternative form of wing nut
(slang, derogatory) Someone with crazy or extreme political views (especially extreme conservative views).
(slang, derogatory, North American itinerant and street populations) A mentally ill homeless person.
(slang, derogatory) Someone perceived as odd, eccentric, and/or extreme.
(slang, rural US) A member of the air force (in a town that hosts a USAF installation).