COO is an acronym that stands for Chief Operating Officer, a high-ranking executive responsible for the day-to-day administrative and operational functions of a business.
Other meanings of coo include:
1. The soft murmuring sound made by a dove or pigeon
2. To speak softly and lovingly
3. In internet slang, coo can mean "cool" or "awesome"
4. As a verb, to express admiration or contentment