Green’s Dictionary of Slang

(orig. US teen) a fan of heavy metal music.

1988		Eble Campus Sl. Oct.
1991		M. Myers et al. Wayne’s World [film script] We pull back to reveal Alan Nilan, a large Viking-like metal head on camera one. And Terry Roberts, a cleaner-cut metal head on camera two.
2007		D. McDonald Luck in the Greater West (2008) 6: The devotion of the metal-heads at his school seemed contrived to him.
2011		IOL News (Western Cape) 10 Feb. 🌐 They will have all the metal heads and goths [...] dusting off their Docs.