I believe that "aboot" thing is a Western Canada accent. Most Canadians say it like "abewwt" similar-to (but not exactly like) an American girl would say "eww that's disgusting."
As a “Western Canadian”, I’ve never heard “about” pronounced any way but what sounds like shout or out, or about. I’ve lived in and/or visited all ten provinces and not once have I heard it pronounced any other way. This is a myth.