Mutton-headed. Stupid.

Mutton monger.  A man addicted to wenching.

Mutton.  In her mutton, i.e. having carnal knowledge of a
  woman.

Muzzle.  A beard.

Muzzler.  A violent blow on the mouth.  The milling
  cove tipped the cull a muzzler; the boxer gave the fellow
  a blow on the mouth.

MYNT.  See mint.

MYRMIDONS.  The constable’s assistants, watchmen, &c.

Nab, or nab cheat.  A hat.  Penthouse nab; a large
  hat.

To nab.  To seize, or catch unawares.  To nab the teaze;
  to be privately whipped.  To nab the stoop; to stand in
  the pillory.  To nab the rust; a jockey term for a horse
  that becomes restive.  To nab the snow:  to steal linen
  left out to bleach or dry.  Cant.

To nab girder, or nob girder.  A bridle.

Nack.  To have a nack; to be ready at any thing, to have
  a turn-for it.

NACKY.  Ingenious.

Nailed. Secured, fixed.  He offered me a decus, and I
  nailed him; he offered me a crown, and I struck or fixed
  him.

Nanny house.  A brothel.

To nap.  To cheat at dice by securing one chance.  Also
  to catch the venereal disease.  You’ve napt it; you are
  infected.

Napping.  To take any one napping; i.e. to come upon
  him unexpectedly, to find him asleep:  as, He caught him
  napping, as Morse caught his mare.

Napper.  The head; also a cheat or thief.

Napper of naps.  A sheep stealer.  Cant.

Nappy ale.  Strong ale.

NASK, or naskin.  A prison or bridewell.  The new nask;
  Clerkenwell bridewell.  Tothil-fields nask; the bridewell
  at Tothil-fields.  Cant.

Nation.  An abbreviation of damnation:  a vulgar term used
  in Kent, Sussex, and the adjacent counties, for very. 
  Nation good; very good.  A nation long way; a very long
  way.

Natty lads.  Young thieves or pickpockets.  Cant.

Natural.  A mistress, a child; also an idiot.  A natural
  son or daughter; a love or merry-begotten child, a bastard.

Navy office.  The Fleet prison.  Commander of the
  Fleet; the warden of the Fleet prison.

Nay word.  A bye-word, proverb.

NAZAKENE foretop.  The foretop of a wig made in imi-
  tation of Christ’s head of hair, as represented by the
painters and sculptors.

Nazy.  Drunken.  Nazy cove or mort; a drunken rogue
  or harlot.  Nazy nabs; drunken coxcombs.

Neb, or nib.  The bill of a bird, and the slit of a pen. 
  Figuratively, the face and mouth of a woman; as, She holds
  up her neb:  she holds up her mouth to be kissed.