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1.
when you are fucking someone up the ass and you shoot a/their dog.
"I did a canadian somersault at the dog kenel, and now im being sued by the owners.
by selffej August 15, 2006
 
2.
A sex act in which a male and female engage in anal intercourse, during which the male shoots the dog of the female. Literally.
Yo, man, I gave this chick a Canadian Somersault the other day! I blew her dog's brains out!
by Kevin "Buddha" January 17, 2008