A familiar expression of contempt for another’s ignorance, as “ah! I see you’re a young one.” How d’ye do, young one?
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Yorkshire Tyke * To YowlNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes