A nick name given by the Irish to Englishmen; bugs having, as it is said, been introduced into Ireland by the English.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Buffle-headed * To BugNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes