Source : Webster's Revised Unabridged Dictionary (1913)

Topper \Top"per\, n.
   1. One that tops, in any sense of the verb; specif.:
      (a) A cover of a top layer or part. [Colloq.]
      (b) One that excels, surpasses, or is extraordinary of its
          kind. [Slang]
      (c) Any device for cutting off tops; as, a turnip topper.
      (d) One who tops steel ingots.
      (e) A three-square float (file) used by comb makers.

   2. A top hat. [Slang or Colloq.]

   3. Tobacco left in the bottom of a pipe bowl; -- so called
      from its being often taken out and placed on top of the
      newly filled bowl. Also, a cigar stump. [Slang]

Source : WordNet®

topper
     n 1: a worker who makes or adds the top to something
     2: a worker who cuts tops off (of trees or vegetables etc.)
     3: the person who is most outstanding or excellent; someone who
        tops all others; "he could beat the best of them" [syn: {best}]
     4: an exceedingly good witticism that surpasses all that have
        gone before
     5: a woman's short coat
     6: a man's hat with a tall crown; usually covered with beaver
        or silk [syn: {dress hat}, {high hat}, {opera hat}, {silk
        hat}, {stovepipe}, {top hat}, {beaver}]