nut-bar

Adjective

 * 1)  Crazy, mad.

Noun

 * 1)  A bar or shaft with an aperture for a bolt or threaded rod to attach to or pass through.
 * 2)  An insane person, a crazy person, a madwoman or madman.
 * 1)  An insane person, a crazy person, a madwoman or madman.

Synonyms

 * ,, ; see also Thesaurus:mad person