bill and coo

详细解释:(情人间)互相接吻及低声交谈

例句：

He took his girlfriend home after the party and they stayed in the car billing and cooing for a long time before she went into her house.聚会结束后他送他的女朋友回家，他俩在车上亲昵低语了很久后她才下车进屋。