The sign for hippie uses a "bent-4" handshape. The fingers can
be thought of as representing the "long hair" worn by hippies.
Aim the "hair" a bit back and then "swing" it forward. Do this
movement twice as if showing how a hippie's hair might swing back
and forth.
HIPPIE:




Animated: "Hippie"

Notes:
It is also common to see this sign done with two hands. (One hand to
each side of the head.)
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American Sign Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars