"My girlfriend who lives in Canada" is a lie invented by hundreds if not thousands of geeky high school boys who can't get any dates and don't want to appear pathetic. The geek will take pictures from magazines or the internet and pass them off as the "Canadian girlfriend". The "girlfriend can also be a spy, cowgirl, model, whatever.
This is also the name of an Avenue Q song about the same subject.
9 times out of 10 a misleading statement indicating that someone lives in Maryland or Virgina NEAR Washington, DC People say this to get street cred.
Person1: Yeah, I live in DC.
Person2: Which quad?
person1: Oh, well . . I really live in Alexandria.
Person2: I live in North East, so I guess I can kick your ass.
Person1: Yeah, I guess so.
When a woman trades companionship and occasional cooking and sex in exchange for a place to stay rent free. Essentially acting af if she was your girlfriend until you actually find one. Then she moves out.
My live-in girlfriend ate all my food and broke all my stuff, but damn the sex is great!
a dismissive way to describe someone who hails from an unsophisticated region. The city mouse would describe the country mouse as "living in the sticks."