Gentleman of three outs.  That is, without money,
  without wit, and without manners:  some add another
  out, i.e. without credit.

Gentry cove.  A gentleman.  Cant.

Gentry cove ken.  A gentleman’s house.  Cant.

Gentry mort.  A gentlewoman.

George.  Yellow George; a guinea.  Brown George:  an
  ammunition loaf.

German duck.  Haifa sheep’s head boiled with onions.

Get.  One of his get; one of his offspring, or begetting.

Gib cat.  A northern name for a he cat, there commonly
  called Gilbert.  As melancholy as a gib cat; as melancholy
  as a he cat who has been caterwauling, whence they
  always return scratched, hungry, and out of spirits. 
  Aristotle says, Omne animal post coitum est triste; to which an
  anonymous author has given the following exception,
  preter gallum gallinaceum, et sucerdotem gratis fornicantem.

Gibberish.  The cant language of thieves and gypsies,
  called Pedlars’ French, and St. Giles’s Greek:  see st.
  Giles’s Greek.  Also the mystic language of Geber,
  used by chymists.  Gibberish likewise means a sort of
  disguised language, formed by inserting any consonant
  between each syllable of an English word; in which case it
  is called the gibberish of the letter inserted:  if F, it is the
  F gibberish; if G, the G gibberish; as in the sentence
  How do you do?  Howg dog youg dog.

GIBBE.  A horse that shrinks from the collar and will not
  draw.

Giblets.  To join giblets; said of a man and woman who
  cohabit as husband and wife, without being married;
  also to copulate.

Gibson, or sir John Gibbon, A two-legged stool, used to
  support the body of a coach whilst finishing.

Gifts.  Small white specks under the finger nails, said to
  portend gifts or presents.  A stingy man is said to be
  as full of gifts as a brazen horse of his farts.

Gift of the gab.  A facility of speech.

Gigg.  A nose.  Snitchel his gigg; fillip his nose.  Grunter’s
  gigg; a hog’s snout.  Gigg is also a high one-horse
  chaise, and a woman’s privities.  To gigg a Smithfield
  hank; to hamstring an over-drove ox, vulgarly called a
  mad bullock.

Gigger.  A latch, or door.  Dub the gigger; open the
  door.  Gigger dubber; the turnkey of a jaol.

To giggle.  To suppress a laugh.  Gigglers; wanton women.

Giles’s or st. Giles’s breed. Fat, ragged, and saucy;
  Newton and Dyot streets, the grand head-quarters-of most
  of the thieves and pickpockets about London, are in St. Giles’s
  Giles’s parish.  St. Giles’s Greek; the cant language,
  called also Slang, Pedlars’ French, and Flash.