The Online Dictionary of the Vulgar Tongue dates from 1811 and this is probably the only full, uncensored version of this dictionary on the internet. All the original crudities have been restored and it offers an interesting perspective on Common English from the time of the Regency and Jane Austen.

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IDEA POT
	The knowledge box, the head. See KNOWLEDGE BOX.
IMPOST TAKERS
	Usurers who attend the gaming-tables, and lend money at great premiums.
IMPUDENT STEALING
	Cutting out the backs of coaches, and robbing the seats.
IMPURE
	A modern term for a lady of easy virtue.
IN TWIG
	Handsome; stilish. The cove is togged in twig; the fellow is dressed in the fashion.
INCHING
	Encroaching.
INDIA WIPE
	A silk handkerchief.
INDIES
	Black Indies; Newcastle.
INDORSER
	A sodomite. To indorse with a cudgel; to drub or beat a man over the back with a stick, to lay CANE upon Abel.
INEXPRESSIBLES
	Breeches.
INKLE WEAVERS
	Supposed to be a very brotherly set of people; 'as great as two inkle weavers' being a proverbial saying.
INLAID
	Well inlaid; in easy circumstances, rich or well to pass.
INNOCENTS
	One of the innocents; a weak or simple person, man or woman.
INSIDE AND OUTSIDE
	The inside of a cunt and the outside of a gaol.
IRISH APRICOTS
	Potatoes. It is a common joke against the Irish vessels, to say they are loaded with fruit and timber, that is, potatoes and broomsticks. Irish assurance; a bold forward behaviour: as being dipt in the river Styx was formerly supposed to render persons invulnerable, so it is said that a dipping in the river Shannon totally annihilates bashfulness; whence arises the saying of an impudent Irishman, that he has been dipt in the Shannon.
IRISH BEAUTY
	A woman with two black eyes.
IRISH EVIDENCE
	A false witness.
IRISH LEGS
	Thick legs, jocularly styled the Irish arms. It is said of the Irish women, that they have a dispensation from the pope to wear the thick end of their legs downwards.
IRISH TOYLES
	Thieves who carry about pins, laces, and other pedlars wares, and under the pretence of offering their goods to sale, rob houses, or pilfer any thing they can lay hold of.
IRON
	Money in general. To polish the king's iron with one's eyebrows; to look out of grated or prison windows, or, as the Irishman expresses them, the iron glass windows. Iron doublet; a prison. See STONE DOUBLET.
IRONMONGER'S SHOP
	To keep an ironmonger's shop by the side of a common, where the sheriff sets one up; to be hanged in chains. Iron-bound; laced. An iron-bound hat; a silver-laced hat.
ISLAND
	He drank out of the bottle till he saw the island; the island is the rising bottom of a wine bottle, which appears like an island in the centre, before the bottle is quite empty.
ITCHLAND, or SCRATCHLAND
	Scotland.
IVORIES
	Teeth. How the swell flashed his ivories; how the gentleman shewed his teeth.
IVY BUSH
	Like an owl in an ivy bush; a simile for a meagre or weasel-faced man, with a large wig, or very bushy hair.