This is an advanced manuever folks, and it takes teamwork. First, you being fucking your girl doggy-style in front of a rather large window. Then, you carefully have a buddy or yours swap in and continue fucking her without her knowing there's been a trade. The Canadian Stranger is complete when you walk outside and wave to her as she's being fucked by your friend.
"I can't believe she dumped me after Craig & I Canadian Stranger'ed her last night."