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.
[Aus]R.G. Barrett Wind & Monkey (2013) [ebook] Some hippie sheila [...] sold it [i.e. marijuana] to me in a pub in Newcastle.
[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.
[Scot]A. Parks Bloody January 3: A grim-faced warden sitting behind a desk flanked by two hippy professor types.
[UK]‘Aidan Truhen’ Price You Pay 39: Fuck LSD [...] because that is a goddam hippy counterculture drug and we all know that drugs are for the one per cent not the fucking Occupy Movement.
[Aus]A. Nette Orphan Road 187: The angry white nationalist of a few days ago seemed to have evaporated, replaced by the scared hippy girl [...] from the New Atlantis compound.
[UK]J. Meades Empty Wigs (t/s) 304: Hippy totem poles high as a house. The Eight Trigrams Café. Hippy fairy lights strung tree to tree. Hippy flower tubs - canna lilies and birds of paradise. Hippy craft shops. Vicious hippy mongrel dogs shitting everywhere. Hippies... rural hippies... bearded hippies... dirty engine oil in their hair hippies... emaciated bad-diet hippies with caved in faces.

In compounds

hippie crack (n.) [crack n.7 ]

(drugs) nitrous oxide.

[US]Da Bomb Summer Supplement 8: Hippie crack (n.) Nitrous oxide.
[US]ONDCP Street Terms 12: Hippie crack — Inhalants .
Mail Online 25 June 🌐 [headline] ‘Kids in balaclavas getting high on hippie crack’.