coo

adj

Etymology: Clipping of cool; compare foo.

1. Cool.

intj

Etymology: Imitative.

1. An expression of approval, fright, surprise, etc.

   “I stood outside the door for a space, letting "I dare not" wait upon "I would", as Jeeves tells me cats do in adages, then turned the handle softly, pushed – also softly – and, carrying on into the interior, found myself confronted by a girl in housemaid's costume who put a hand to her throat like somebody in a play and leaped several inches in the direction of the ceiling. "Coo!" she said, having returned to terra firma and taken aboard a spot of breath. "You gave me a start, sir!" […] "If you cast an eye on him, you will see that he's asleep now." "Coo! So he is."”

   “The last track on each of the three sections is a professional course, where you can customise your bike by changing the tyres and the size of chainwheel. Coo!”

noun

1. Initialism of chief operating officer.

   “Atsme similarly protested when editors sought to portray Trump as racist by referring to a reconstructed and uncorroborated conversation in a book by a former COO at one of Trump’s companies, which attributes to Trump defamatory and racist remarks against black people.”

2. Initialism of country of origin.

verb

Etymology: Onomatopoeic; compare Dutch koeren.

1. To make a soft murmuring sound, as a pigeon.

   “No birds, except as birds of paſſage, flew, / No bee was known to hum, no dove to coo.”

   “DUET—MAYOR and MAUD. […] Like a Dove I'll coo and bill, pretty Maud, / I will not coo and bill, Mr. Mayor.”

2. To speak in an admiring fashion, to be enthusiastic about.

   “They were too busy cooing over the baby and his parents were too busy cooing over each other.”