The Collaborative International Dictionary of English v.0.48:

Top \Top\, v. i. [imp. & p. p. Topped; p. pr. & vb. n.
   Topping.]
   1. To rise aloft; to be eminent; to tower; as, lofty ridges
      and topping mountains. --Derham.
      [1913 Webster]

   2. To predominate; as, topping passions. "Influenced by
      topping uneasiness." --Locke.
      [1913 Webster]

   3. To excel; to rise above others.
      [1913 Webster]

            But write thy, and top.               --Dryden.
      [1913 Webster]

   4. (Golf) To strike a ball above the center.
      [Webster 1913 Suppl.]

   5. (Naut.) To rise at one end, as a yard; -- usually with up.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Topping \Top"ping\, a.
   1. Rising above; surpassing.
      [1913 Webster]

   2. Hence, assuming superiority; proud.
      [1913 Webster]

            The great and flourishing condition of some of the
            topping sinners of the world.         --South.
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   3. Fine; gallant. [Slang] --Johnson.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Topping \Top"ping\, n.
   1. The act of one who tops; the act of cutting off the top.
      [1913 Webster]

   2. (Naut.) The act of raising one extremity of a spar higher
      than the other.
      [1913 Webster]

   3. pl. That which comes from hemp in the process of
      hatcheling.
      [1913 Webster]

   4. (Angling) The tail of an artificial fly.
      [Webster 1913 Suppl.]

   5. something placed on top of another thing, such as a sauce
      or garnish on food; as, a three-scoop banana split with
      three different toppings; an ice-cream cone with chocolate
      fudge topping.
      [PJC]

   Topping lift (Naut.), a large, strong tackle employed to
      raise or top the end of a gaff, or of a boom.
      [1913 Webster]

WordNet (r) 3.0 (2006):

topping
    adj 1: excellent; best possible [syn: top-flight, top-hole,
           topping]
    n 1: a flavorful addition on top of a dish

Moby Thesaurus II by Grady Ward, 1.0:

113 Moby Thesaurus words for "topping":
   Olympian, a cut above, abacus, above, acanthus, aerial, ahead,
   airy, altitudinous, annulet, architrave, ascendant, ascending,
   aspiring, astragal, bell, better, capping, capstone, chosen, cima,
   colossal, console, consummating, coping, corbel, cornice, crown,
   crowning, culminating, cyma, dentil, distinguished, dominating,
   drip, drop, eclipsing, elevated, eminent, ethereal, exalted,
   exceeding, excellent, excelling, finer, finial, first-chop,
   first-class, first-rate, frieze, frontispiece, frosting, greater,
   haughty, head, header, heading, headpiece, high, high-pitched,
   high-reaching, high-set, high-up, higher, icing, in ascendancy,
   in the ascendant, keystone, lintel, lofty, major, marked,
   monumental, mounting, of choice, one up on, outstanding,
   outtopping, over, overlooking, overtopping, prominent, rare,
   rivaling, sconce, soaring, spiring, steep, sublime, super,
   superior, superlative, supernal, surpassing, taenia, tip-top,
   top-drawer, top-hole, top-notch, topflight, topless, toplofty,
   tops, towering, towery, transcendent, transcendental, transcending,
   treenail, tympanum, uplifted, upper, upreared