Said to have been originally the cry of the huzzars or Hungarian light horse; but now the national shout of the English, both civil and military, in the sea phrase termed a cheer; to give three cheers being to huzza thrice.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
hussy * hypNathan Bailey's 1721 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes