Bah, nobody really says that!
Canadian raising, as it's called, means that instead of the sound you hear in "how", before a voiceless consonant (like 't' in 'about'), it becomes the same sound as in 'cup'. Not sure how I'd write it in layman's terms... if "about" is the General American pronunciation, the general Canadian pronunciation is more akin to "abuwt" (with the 'u', as mentioned, as in 'cup'). In certain parts, it sounds a bit more like "aboat"...
