To cry peccavi; to acknowledge one’s self in an error, to own a fault: from the Latin PECCAVI, I have sinned.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Pear Making * PeckNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes