Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Headbanger" Definition
noun
Slang a fan of heavy metal music: "an arena full of headbangers holding their lighters aloft” ( christopher john farley).
Source: American Heritage Dictionary
One who dances by violently shaking the head in time to the music.
Source: Wiktionary
One who enjoys heavy metal rock music, to which this sort of dance is usually performed.
Source: Wiktionary
A mad or eccentric person.
Source: Wiktionary
A musician who performs hard rock.
Source: Merriam-Webster
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