The blowen was nutts upon the kiddey because he is well-hung; the girl is pleased with the youth because his genitals are large.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
To Well * Westminster WeddingNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes