The name given to people that ride motorbikes. In Latin America it is very common to see many people riding motorbikes to do their jobs.
People who work as messengers in motorbikes are called "motorizados". Common expresions: I've just sent my motorbiker, please wait for him. or the Motorbiker will be there in few minutes or Send me your motorbiker. Nowadays, it is very common to see streets and avenues everywhere in Venezuela and Colombia crowded of motorbikers, either they are messanger or not.