They vary in pitch and intelligibility as they reach their excited climaxes—or when she interrupts them to coo at Max.
Modern feminists are finally having their Arab Spring, thanks to Facebook coo Sheryl Sandberg.
“In every area, women have steadily made progress—except at the top,” said Sheryl Sandberg, coo of Facebook.
1660s, echoic of doves; the phrase to bill and coo is first recorded 1816. Related: Cooing. The noun is recorded from 1729.