According to the footnotes given in Cindy Mao and Ma Baolin's Sing Chinese
, "Throw a handkerchief" is a nursery rhyme telling of a popular children's game which is played by a group of children sitting in a circle facing each other. One child is selected to walk behind the circle with a handkerchief in hand. It is to be quietly placed behind one of the sitting kids, who must then quickly grab it, get up and catch the child. Otherwise he/she must walk behind the circle and do the same trick.