Green’s Dictionary of Slang

1. insane, crazy.

1610

Rowlands Martin Mark-all 36: Abram madde.

2. (UK Und.) naked.

1612		Dekker O per se O M: Who therefore would pity such imposters [...] whose going Abram (that is to say, naked) is not for want of cloathes, but to stirre up men to pittie.
1665		Head Eng. Rogue I 47: Abram, Naked.
1725		New Canting Dict. n.p.: abram, Naked, without Cloaths, or scarce enough to hide the nakedness.
1728		Defoe Street Robberies Considered 30: Abram, Naked.
1737		Bailey Universal Etym. Eng. Dict.
1750–1882		B.M. Carew Life and Adventures.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		‘Jon Bee’ Dict. of the Turf, the Ring, the Chase, etc.
c.1850		Duncombe New and Improved Flash Dict.