When the majesty of the people was a favourite terra in the House of Commons, a celebrated wit, seeing chimney sweepers dancing on a May-day, styled them the young princes.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Prince Prig * PrincodNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes