Would I had Kemp’s shoes to throw after you. BEN JONSON. Perhaps Kemp was a man remarkable for his good luck or fortune; throwing an old shoe, or shoes, after any one going on an important business, being by the vulgar deemed lucky.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Kemp’s Morris * KenNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes