“Yippie: Close contemporary of the hippy, but more actively involved in political action, particularly in protests against American involvement in Vietnam and the methods of US police. The term was coined by one of the movement’s leaders, Jerry Reuben [sic], and is derived from the initials of the Youth International Party and hippy. The Yippie movement faded in the early 1970s, possible because of the cessation of US involvement in Vietnam. ”
Excerpted from: Cook, Chris. Dictionary of Historical Terms. New York: Gramercy, 1998.