1. noun /ˈhɪpi/
a) A teenager who imitated the beatniks
b) One who chooses not to conform to prevailing social norms: especially one who ascribes to values or actions such as acceptance or self-practice of recreational drug use, liberal or radical sexual mores, advocacy of communal living, strong pacifism or anti-war sentiment, etc.
2. adjective /ˈhɪpi/
a) Of or pertaining to hippies: e.g., “the hippie era”.
b) Not conforming to generally accepted standards: e.g., “Despite being for the widely-used Windows operating system, rather than using the commonly-used RAR or ZIP file-compression formats, they used a bunch of hippie compression formats instead”.
Wikipedia foundation.