拟声词。
A new manufactory of a nectar, between soda-water and ginger-beer, and called pop, because 'pop goes the cork' when it is drawn. [Southey, letter, 1812]Sense of "ice cream on a stick" is from 1923 (see popsicle). Meaning "the (brief) time of a 'pop'" is from 1530s. Pop goes the weasel, a country dance, was popular 1850s in school yards, with organ grinders, at court balls, etc.