Jackanapes.  An ape; a pert, ugly, little fellow.

Jacked. Spavined.  A jacked horse.

JACKMEN.  See jarkmen.

JACKEY.  Gin.

Jacob.  A soft fellow.  A fool.

Jacob.  A ladder:  perhaps from Jacob’s dream.  Cant.  Also
  the common name for a jay, jays being usually taught to
  say, Poor Jacob! a cup of sack for Jacob.

Jacobites.  Sham or collar shirts.  Also partizans for the
  Stuart family:  from the name of the abdicated king, i.e. 
  James or Jacobus.  It is said by the whigs, that God
  changed Jacob’s name to Israel, lest the descendants of
  that patriarch should be called Jacobites.

Jade.  A term of reproach to women.

JAGUE.  A ditch:  perhaps from jakes.

Jail birds.  Prisoners.

Jakes.  A house of office, a cacatorium.

Jammed. Hanged.  Cant.

JANIZARIES.  The mob, sometimes so called; also bailiffs,
  their setters, and followers.

Japanned. Ordained.  To be japanned; to enter into holy
  orders, to become a clergyman, to put on the black cloth: 
  from the colour of the japan ware, which is black.

JARK.  A seal.

Jarkmen.  Those, who fabricate counterfeit passes, licences,
  and certificates for beggars.

Jarvis.  A hackney coachman.

JASON’S Fleece.  A citizen cheated of his gold.

Jaw.  Speech, discourse.  Give us none of your jaw; let us
  have none of your discourse.  A jaw-me-dead; a talkative
  fellow.  Jaw work; a cry used in fairs by the sellers of
  nuts.

JAZEY.  A bob wig.

Idea pot.  The knowledge box, the head.  See knowledge
  box.

JEFFY.  It will be done in a jeffy; it will be done in a short
  space of time, in an instant.

Jehu.  To drive jehu-like; to drive furiously:  from a king
  of Israel of that name, who was a famous charioteer, and
  mentioned as such in the Bible.

JEM.  A gold ring.  Cant.

Jemmy fellow.  A smart spruce fellow.

Jemmy.  A crow.  This instrument is much used by housebreakers. 
Sometimes called Jemmy Rook.

Jenny.  An instrument for lifting up the grate or top of a
  show-glass, in order to rob it.  Cant.

JERRYCUMMUMBLE.  To shake, towzle, or tumble about.

Jerry sneak.  A henpecked husband:  from a celebrated
  character in one of Mr. Foote’s plays, representing a man
  governed by his wife.

Jessamy.  A smart jemmy fellow, a fopling.

JESIUT.  See to box the Jesuit.

Jesuitical.  Sly, evasive, equivocal.  A jesuitical answer;
  an equivocal answer.