When you put your hard-on up between your stomach and wasitline of your pants so the top comes out. Helps protect from the dreaded "Pitchin' a Tent" look. Do not use if shirtless.
"I popped a boner in class so I used the old canadian beltbuckle manuver to get out with dignity."
Generally what people from Canada should be referred to, that is, based on the logic that proper English dictates that Canadians are people from some place called "Canadia," not Canada.
The act of farting while fully clothed in full snow attire, very similar to the Dutch Oven, but is done to the self, by a process of the fart rising as hot air tends to do from your pants up your snow jacket and damn straight into your nose. Note: the Dutch Oven is done to another under the covers, the Canadien oven is far more potent and has full reprucussion upon the farter and is some sort of a form of suicide or inflictng pain upon oneself
Dammit Chase, I just Canadien Ovened myself, I think I might die from the smell!