The nine of diamonds; diamonds, it is said, imply royalty, being ornaments to the imperial crown; and every ninth king of Scotland has been observed for many ages, to be a tyrant and a curse to that country. Others say it is from its similarity to the arms of Argyle; the Duke of Argyle having been very instrumental in bringing about the union, which, by some Scotch patriots, has been considered as detrimental to their country.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Curry * Curse of GodNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes