Back in the day, matatu conductors, also known as makangas, were the harbingers of Nairobi urban sub-culture. They influenced the language, fashion and entertainment trends in the city. If makangas were not wearing it, then it was not hip. They had a finger on the pulse of the ever-changing fashion sense.
This was transferred to the matatus they worked in where the name, graffiti, design and music played matched the projected image. In came the 'manyangas' and later just 'nganyas' for the spruced-up matatus.