A parson’s barn; never so full but there is still room for more. Bit by a barn mouse, tipsey, probably from an allusion to barley.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Barking Irons * BarnabyNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes