Based in the suburbs located just oustide Toronto is a bus company named Viva. Along every Viva stop, there is also an electronic ticket station in which you buy from and then just hop onto the Viva bus. The bus drivers, however, do not ask you to show you their ticket for the Viva company runs on an honesty system. They believe that all customers will have either a ticket or bus pass.
As a result, many a customer take advantage of the honesty system and pay nothing and get on for free. Along certain lines, namely the Yonge Street line, will have Viva police placed at random stops to search bus riders for their tickets.
The term freeva is most likely coined by the teenagers that live in the areas in which the Viva busses travel. Freeva is portmanteau of the word 'free' and 'Viva.'