Fly slicers.  Life-guard men, from their sitting on
  horseback, under an arch, where they are frequently observed
  to drive away flies with their swords.

Flyer.  To take a flyer; to enjoy a woman with her
  clothes on, or without going to bed.

Flyers.  Shoes.

Fly-flapped. Whipt in the stocks, or at the cart’s tail.

Flying Camps.  Beggars plying in a body at funerals.

Flying GIGGERS.  Turnpike gates.

Flying house.  A lock in wrestling, by which he who
  uses it throws his adversary over his head.

Flying Pasty.  Sirreverence wrapped in paper and
  thrown over a neighbour’s wall.

Flying porters.  Cheats who obtain money by pretending
  to persons who have been lately robbed, that they
  may come from a place or party where, and from whom,
  they may receive information respecting the goods stolen
  from them, and demand payment as porters.

Flying STATIONERS.  Ballad-singers and hawkers of penny
  histories.

FLYMSEY.  A bank note.

Fob.  A cheat, trick, or contrivance, I will not be fobbed off
  so; I will not be thus deceived with false pretences.  The
  fob is also a small breeches pocket for holding a watch.

Fog.  Smoke.  Cant.

Fogey.  Old Fogey.  A nickname for an invalid soldier: 
  derived from the French word fougeux, fierce or fiery.

Fogle.  A silk handkerchief,

FOGRAM.  An old fogram; a fusty old fellow.

Fogus.  Tobacco.  Tip me a gage of fogus; give me a
  pipe of tobacco.  Cant.

Fool.  A fool at the end of a stick; a fool at one end, and
  a maggot at the other; gibes on an angler.

Fool Finder.  A bailiff.

Foolish.  An expression among impures, signifying the
  cully who pays, in opposition to a flash man.  Is he
  foolish or flash?

Foot pads, or low pads.  Rogues who rob on foot.

Foot WABBLER.  A contemptuous appellation for a foot
  soldier, commonly used by the cavalry.

FOOTMAN’S MAWND.  An artificial sore made with unslaked
  lime, soap, and the rust of old iron, on the back
  of a beggar’s hand, as if hurt by the bite or kick of a horse.

Footy despicable.  A footy fellow, a despicable fellow;
  from the French foutue.

Forefoot, or paw.  Give us your fore foot; give us your hand.

Foreman of the jury.  One who engrosses all the talk
  to himself, or speaks for the rest of the company.