Part of the Theatre at Oxford, where the heads of houses sit; those gentlemen being by the wits of the university called sculls. [skulls — Liam]
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Goldfinch * GollumpusNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes