Source : Webster's Revised Unabridged Dictionary (1913)

Snuffle \Snuf"fle\, n.
   1. The act of snuffing; a sound made by the air passing
      through the nose when obstructed.

            This dread sovereign, Breath, in its passage, gave a
            snort or snuffle.                     --Coleridge.

   2. An affected nasal twang; hence, cant; hypocrisy.

   3. pl. Obstruction of the nose by mucus; nasal catarrh of
      infants or children. [Colloq.]

Snuffle \Snuf"fle\, v. i. [imp. & p. p. {Snuffled}; p. pr. & vb.
   n. {Snuffling}.] [Freq. of snuff, v.i.; akin to LG. snuffeln,
   G. schn["u]ffeln, D. snuffeln, Dan. sn["o]vle. Cf.
   {Sniffle}.]
   To speak through the nose; to breathe through the nose when
   it is obstructed, so as to make a broken sound.

         One clad in purple Eats, and recites some lamentable
         rhyme . . . Snuffling at nose, and croaking in his
         throat.                                  --Dryden.

Source : WordNet®

snuffle
     n : the act of breathing heavily through the nose (as when the
         nose is congested) [syn: {sniffle}, {snivel}]

snuffle
     v 1: sniff or smell inquiringly [syn: {snuff}]
     2: snuff up mucus through the nose [syn: {snivel}]
     3: cry or whine with snuffling; "Stop snivelling--you got
        yourself into this mess!" [syn: {snivel}, {sniffle}, {blubber},
         {blub}]