1 definition by Paul Driver
"bitchin" is an idiomatic expression originally from the left coast of the United States of America, circa mid to late 1970s, coinciding with the rise of Disco(the Bee Gees), and the "BITCH" fashion trend (where young "woman's libbers" commonly wore necklaces and shirts emblazoned with "BITCH"), used originally by "surfer types", deriving from "man that wave is a bitch" to "what a ride, that wave was bitchin'". It quickly spread to main stream American vernacular as an affermation.
by Paul Driver April 28, 2006