crazy about, eager, a little crazy, slightly crazy
Doidinho.
Crazy.
— O Auto da Compadecida (2000)
Está doidinho, o pobre padre.
The poor priest is completely mad.
Tom ficou doidinho pela Mary.
Tom fell madly in love with Mary.
Estou doidinho pra botar um na chave!
I can't wait to stick one in the keyhole!