A sideshow performer who hammers nails or similar items through his or her nostril into the nasal cavity; human blockhead.
A stupid person.
To perform as a human blockhead.
To behave in a stupid manner.
Someone with large, protruding ears.
A nut with wing-like projections to provide leverage in turning with thumb and forefinger.
One who advocates extreme measures or changes, especially if they hold or are perceived to hold far-right viewpoints; a radical or reactionary.