Well sometimes like when it’s the only word in a sentence we use it like “huh?” but more often it’s at the end of a statement where it’s to make sure that the listener heard us and (and this is the uniquely Canadian part) to seek agreement from them.
One of the best ways that I’ve heard to distinguish between the three Atlantic English dialects is to check on the number of backwards “ah” sounds. In “I’d rather dance with my father” the Brits pronounce all three "a"s differently, the Canucks pronounce just the last one differently and the Yanks (if from Texas anyway) pronounce them all the same.
Other tests for Yankee spies are: to ask them for a Duo-tang; to see if they refer to “grades” instead of “marks” in school; and see if they use “studio” instead of “bachelor apartment”.
