headbanger

head +‎ banger

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headbanger (plural headbangers)

1. One who dances by violently shaking the head in time to the music.
2. (by extension) One who enjoys heavy metal (rock) music, to which this sort of dance is usually performed.
3. A mad or eccentric person. (Can we add an example for this sense?)
4. A kind of chin-up or pull-up exercise where the head is kept in line with the bar.

• (heavy metal fan): metalhead, metaller

• (mad or eccentric person): Tony Thorne (2014), “headbanger”, in Dictionary of Contemporary Slang, 4th edition, London; […]: Bloombury