DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Coo \Coo\, v. i. [imp. & p. p. Cooed; p. pr. & vb. n.
      Cooing.]
      1. To make a low repeated cry or sound, like the
         characteristic note of pigeons or doves.
         [1913 Webster]
               The stockdove only through the forest cooes,
               Mournfully hoarse.                    --Thomson.
         [1913 Webster]
      2. To show affection; to act in a loving way. See under
         Bill, v. i. "Billing or cooing." --Byron.
         [1913 Webster] Cooey