Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • intransitive v. To utter the murmuring sound of a dove or pigeon or a sound resembling it.
  • intransitive v. To talk fondly or amorously in murmurs: The visitors cooed over the newborn baby.
  • transitive v. To express or utter with soft murmuring sounds.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. cool
  • n. The murmuring sound made by a dove or pigeon.
  • v. To make a soft murmuring sound, as a pigeon.
  • v. To speak in an admiring fashion, to be enthusiastic about.
  • interj. Expression of fright, surprise, approval, etc.

from the GNU version of the Collaborative International Dictionary of English

  • intransitive v. To make a low repeated cry or sound, like the characteristic note of pigeons or doves.
  • intransitive v. To show affection; to act in a loving way. See under Bill, v. i.

from The Century Dictionary and Cyclopedia

  • To utter a low, plaintive, murmuring sound (imitated by the sound of the word) characteristic of pigeons or doves.
  • Hence To converse affectionately, like cooing doves; make love in murmuring endearments: commonly in the phrase to bill and coo. See bill, v. i.
  • To utter by cooing.
  • To call.
  • n. The characteristic murmuring sound uttered by doves and pigeons.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the sound made by a pigeon
  • v. cry softly, as of pigeons
  • v. speak softly or lovingly

Etymologies

Imitative.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Of onomatopoetic/imitative origin. (Wiktionary)
Shortening of cool. Compare foo. (Wiktionary)

Examples

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  • JM overheard some doves plotting a coo.

    July 27, 2011

  • Jane Smiley on pigeons.

    February 1, 2008

  • Cow (Scots).

    November 27, 2007