LSD, lysergic acid diethylamide.
In the end, though, there is one sure way to distinguish a real hippie from his assorted sympathizers: hippies drop acid. That is, real hippies frequently, if irregularly, ingest LSD.
A verb describing something that represents or fits in with the Rastafarian, or “hipster” culture; relating to a chill, and/or down to earth style or idea. Typically the counterpart, or opposite of “based”, which relates to overly political ideas that generally are made to hate on another culture or idea.
“You got some acid sunglasses, man!”
Person 1: Oh hey acid
Acid: OMG I HAVE SO MUCH TO TELL YOU ABOUT NATALIA!
Person 1: …. not again
Acid is wrong...in some people's eyes
Aaaaahhh my face is burning of acid!!
Anal Cranial Inversion Disorder
ACID = Short for "Head Stuck Up Their Ass"