Green’s Dictionary of Slang

hippie adj.

also hippy
[hippie n.2 (3)]

pertaining to the style or fashion of the sixties, preaching a philosophy of peace and love.

L. Fiedler Mutants in Coll. Essays 2 (1971) 398: The hippier young are not alone, however, in their taste for the insane [i.e. LSD].
International Times 5 Jan. n.p.: Beautiful people wanted for outdoor hippy production.
[US]R. Price Ladies’ Man (1985) 22: Wearing only a dirty rib-high suede hippie vest with foot-long fringes.
[UK]A. Sayle Train to Hell 105: If they want to be hippy-junkies, it’s fixed.
[UK]T. Blacker Fixx 132: No hippy connotations here.
[UK]J. Poller Reach 14: I ordinarily loathe pseudo-Buddhist hippie bullshit.
[UK]N. Griffiths Grits 21: Liker sixties wanky hippy thing.
[US]Simon & Burns ‘Get Some’ Generation Kill ep. 1 [TV script] You some kinda goddam hippie faggot?
[US]A. Steinberg Running the Books 84: One look at Yoni’s hippie getup [...] The car was searched.

In compounds