The Collaborative International Dictionary of English v.0.48:

Wahoo \Wa*hoo"\, n.
   A dark blue scombroid food fish (Acanthocibium solandri or
   Acanthocibium petus) of Florida and the West Indies.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Wahoo \Wa*hoo"\, n.
   Any of various American trees or shrubs; specif.:
   (a) A certain shrub (Evonymus atropurpureus) having purple
       capsules which in dehiscence expose the scarlet-ariled
       seeds; -- called also burning bush.
   (b) Cascara buckthorn.
   (c) Basswood.
       [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

wahoo
    n 1: upright deciduous plant with crimson pods and seeds; the
         eastern United States from New York to Florida and Texas
         [syn: strawberry bush, wahoo, Euonymus americanus]
    2: deciduous shrub having purple capsules enclosing scarlet
       seeds [syn: wahoo, burning bush, Euonymus
       atropurpureus]
    3: large fast-moving predacious food and game fish; found
       worldwide [syn: wahoo, Acanthocybium solandri]