headbanger

One who dances by violently shaking the head in time to the music.

One who enjoys heavy metal (rock) music, to which this sort of dance is usually performed.

A violently deranged, extreme or fanatical person; a nutcase.

A silly or eccentric person.

A political hardliner, especially an obstructive one.

A person who engages in street violence, especially in support of a political group.

A kind of chin-up or pull-up exercise where the head is kept in line with the bar.