Source : Webster's Revised Unabridged Dictionary (1913)

Fulsome \Ful"some\, a. [Full, a. + -some.]
   1. Full; abundant; plenteous; not shriveled. [Obs.]

            His lean, pale, hoar, and withered corpse grew
            fulsome, fair, and fresh.             --Golding.

   2. Offending or disgusting by overfullness, excess, or
      grossness; cloying; gross; nauseous; esp., offensive from
      excess of praise; as, fulsome flattery.

            And lest the fulsome artifice should fail Themselves
            will hide its coarseness with a veil. --Cowper.

   3. Lustful; wanton; obscene; also, tending to obscenity.
      [Obs.] ``Fulsome ewes.'' --Shak. -- {Ful"some*ly}, adv. --
      {Ful"some*ness}, n. --Dryden.

Source : WordNet®

fulsome
     adj : unpleasantly and excessively suave or ingratiating in manner
           or speech; "buttery praise"; "gave him a fulsome
           introduction"; "an oily sycophantic press agent";
           "oleaginous hypocrisy"; "smarmy self-importance"; "the
           unctuous Uriah Heep" [syn: {buttery}, {oily}, {oleaginous},
            {smarmy}, {unctuous}]