hulverhead, n. — Green’s Dictionary of Slang

hulverhead n.

[Norfolk dial. hulver, holly; the wood of a holly bush is notably hard]

a fool.

1637		R. Brome Eng. Moor III ii: He compounded for a sum of money with an old man, one Hulverhead, to keep him for his life time.
c.1698		B.E. Dict. Canting Crew n.p.: Hulverhead a silly foolish Fellow.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
c.1750–1882		B.M. Carew Life and Adventures.
a.1790		H.T. Potter New Dict. Cant (1795).
1899		Cornishman 27 July 6/2: Hulver-head, Jack Adam [...] synonyms in the language of the canting crew, for fool.