Young men in the 1950's and 60's had their taste of the desire to be famous validated by the automobile they drove. The right car sent the right message of fame and the driver was of course famous because of the car.
With the right car you would sit a little taller and feel the buzz of being famous. Were you “Cool”? Do you really have to ask? If you had a GTO you were beyond famous, locally of course.
The GTO (which stood for Gran Turismo Omologato) was a car that sent the right message. In today's world you would say it was the G.O.A.T. - Greatest Of All Time.