There is a story related of the celebrated Ben Jonson, who
  always dressed very plain; that being introduced to the
  presence of a nobleman, the peer, struck by his homely
  appearance and awkward manner, exclaimed, as if in doubt,
  “you Ben Johnson! why you look as if you could not say
  Boh to a goose!” “Boh!” replied the wit.

Bold.  Bold as a miller’s shirt, which every day takes a
  rogue by the collar.

Bolt.  A blunt arrow.

Bolt upright.  As erect, or straight up, as an arrow
  set on its end.

To bolt.  To run suddenly out of one’s house, or hiding
  place, through fear; a term borrowed from a rabbit-warren,
  where the rabbits are made to bolt, by sending
  ferrets into their burrows:  we set the house on fire, and
  made him bolt.  To bolt, also means to swallow meat
  without chewing:  the farmer’s servants in Kent are
  famous for bolting large quantities of pickled pork.

Bones.  Dice.

Bone box.  The mouth.  Shut your bone box; shut your
  mouth.

Bone picker.  A footman.

Boned. Seized. apprehended, taken up by a constable.  Cant.

Bolus.  A nick name for an apothecary.

Bonesetter.  A hard-trotting horse.

Booby, or dog booby.  An awkward lout, clodhopper, or
  country fellow.  See clodhopper and lout.  A bitch
  booby; a country wench.

Booby Hutch.  A one-horse chaise, noddy, buggy, or
  leathern bottle.

Books.  Cards to play with.  To plant the books; to place
  the cards in the pack in an unfair manner.

Book-keeper.  One who never returns borrowed books. 
  Out of one’s books; out of one’s fevor.  Out of his books;
  out of debt.

Boot catcher.  The servant at an inn whose business
  it is to clean the boots of the guest.

Boots.  The youngest officer in a regimental mess, whose
  duty it is to skink, that is, to stir the fire, snuff the
  candles, and ring the bell.  See skink.—­To ride in any one’s
  old boots; to marry or keep his cast-off mistress.

Booty.  To play booty; cheating play, where the player
  purposely avoids winning.

Bo-peep.  One who sometimes hides himself, and sometimes
  appears publicly abroad, is said to-play at bo-peep. 
  Also one who lies perdue, or on the watch.

BORACHIO.  A skin for holding wine, commonly a goat’s;
  also a nick name for a drunkard.

Borde.  A shilling.  A half borde; a sixpence.

Bordello.  A bawdy house.

Bore.  A tedious, troublesome man or woman, one who
  bores the ears of his hearers with an uninteresting tale;
  a term much in fashion about the years 1780 and 1781.