A shilling. To drive one’s hogs; to snore: the noise made by some persons in snoring, being not much unlike the notes of that animal. He has brought his hogs to a fine market; a saying of any one who has been remarkably successful in his affairs, and is spoken ironically to signify the contrary. A hog in armour; an awkward or mean looking man or woman, finely dressed, is said to look like a hog in armour. To hog a horse’s mane; to cut it short, so that the ends of the hair stick up like hog’s bristles. Jonian hogs; an appellation given to the members of St. John’s College, Cambridge.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
See also the definition in Nathan Bailey's 1736 dictionary of canting and thieving slang.
Hodmandods * Hog GrubberNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes