headbanger
From Longman Dictionary of Contemporary Englishheadbangerhead‧bang‧er /ˈhedbæŋə $ -ər/ noun [countable] informalAPM someone who enjoys heavy metal music and moves their head around violently to the beat of the music —headbanging noun [uncountable] —headbang verb [intransitive]Examples from the Corpusheadbanger• It all led to only two possibilities: he was either a whirling business genius or a complete headbanger.