Velvet.  To tip the velvet; to put one’s tongue into a
  woman’s mouth.  To be upon velvet; to have the best
  of a bet or match.  To the little gentleman in velvet, i. e.
  the mole that threw up the hill that caused Crop (King
  William’s horse) to stumble; a toast frequently drank by
  the tories and catholics in Ireland.

Venerable monosyllable.  Pudendum muliebre.

VENUS’S curse.  The venereal disease.

Vessels of paper.  Half a quarter of a sheet.

Vicar of Bray.  See Bray.

Vice Admiral of the narrow seas.  A drunken man
  that pisses under the table into his companions’ shoes.

Victualling office.  The stomach.

Vincent’s law.  The art of cheating at cards, composed of
  the following associates:  bankers, those who play booty;
  the gripe, he that betteth; and the person cheated, who
  is styled the vincent; the gains acquired, termage.

Vinegar.  A name given to the person who with a whip
  in his hand, and a hat held before his eye, keeps the
  ring clear, at boxing-matches and cudgel-playing; also,
  in cant terms, a cloak.

Vixen.  A termagant; also a she fox, who, when she has
  cubs, is remarkably fierce.

To vowel.  A gamester who does not immediately pay
  his losings, is said to vowel the winner, by repeating the
  vowels I. O. U. or perhaps from giving his note for the
  money according to the Irish form, where the acknowledgment
  of the debt is expressed by the letters I. O. U. which,
  the sum and name of the debtor being added, is deemed a
  sufficient security among gentlemen.

Uncle.  Mine uncle’s; a necessary house.  He is gone to
  visit his uncle; saying of one who leaves his wife soon after
  marriage.  It likewise means a pawnbroker’s:  goods pawned
  are frequently said to be at mine uncle’s, or laid up in
  lavender.

Understrapper.  An inferior in any office, or department.

Under dubber.  A turnkey.

Unfortunate gentlemen.  The horse guards, who thus
  named themselves in Germany, where a general officer
  seeing them very awkward in bundling up their forage,
  asked what the devil they were; to which some of them
  answered, unfortunate gentlemen.

Unfortunate women.  Prostitutes:  so termed by the
  virtuous and compassionate of their own sex.

Ungrateful man.  A parson, who at least once a week
  abuses his best benefactor, i.e. the devil.

UNGUENTUM aureum.  A bribe.

Unicorn.  A coach drawn by three horses.

Unlicked cub.  A rude uncouth young fellow.