The Collaborative International Dictionary of English v.0.48:

Blarney \Blar"ney\, v. t. [imp. & p. p. Blarneyed (-n[i^]d);
   p. pr. & vb. n. Blarneying.]
   To influence by blarney; to wheedle with smooth talk; to make
   or accomplish by blarney. "Blarneyed the landlord." --Irving.
   [1913 Webster]

         Had blarneyed his way from Long Island.  --S. G.
                                                  Goodrich.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

blarney \blar"ney\ (bl[aum]r"n[y^]), n. [Blarney, a village and
   castle near Cork in Ireland.]
   Smooth, wheedling talk; flattery. [Colloq.]
   [1913 Webster]

   Blarney stone, a stone in Blarney castle, Ireland (built in
      1446), said to make those who kiss it proficient in the
      use of blarney.

   Note: The origin of the stone is uncertain. In order to kiss
         the Blarney stone, which is located in the side of the
         castle, one must be held upside-down by the feet and
         lowered into the proper position from an opening in an
         overhang in the parapet. It is an experience eschewed
         by some tourists.
         [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

blarney
    n 1: flattery designed to gain favor [syn: blarney, coaxing,
         soft soap, sweet talk]
    v 1: influence or urge by gentle urging, caressing, or
         flattering; "He palavered her into going along" [syn:
         wheedle, cajole, palaver, blarney, coax, sweet-
         talk, inveigle]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "blarney":
   adulation, banter, blandish, blandishment, bunkum, cajole,
   cajolement, cajolery, compliment, con, eyewash, fair words,
   fawning, flattery, grease, honeyed phrases, honeyed words, incense,
   oil, palaver, praise, pretty lies, soap, soft soap, soft-soap,
   sweet nothings, sweet talk, sweet words, sweet-talk, sycophancy,
   wheedle, wheedling