yippy

Definition

Slang

  • noun a hippy activist, a member of the so-called ‘Youth International Party’ founded by Abbie Hoffman and Jerry Rubin in 1968, the date of the Chicago Democratic Convention where they put forward a pig as a presidential candidate. This short-lived movement was a loose coalition of radicals, anarchists, libertarians and left-wingers concerned with ‘situationist’ and confrontational political methods. The term was sometimes applied to other politically involved hippies and was one of the sources (albeit a heavily ironic one) of the later word yuppie.
http://www.dictionarycentral.com/definition/yippy.html