To take a slice; to intrigue, particularly with a married woman, because a slice off a cut loaf is not missed.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Sleeveless Errand * SlipgibbetNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes