From Canada to Brazil
refers to legth from a girls ankle to the hip in which they have to shave.

Also a synonym for "from head to toe".
Girl 1: You're going to the pool party tomorrow, right?
Girl 2: Yeah, but I have to shave from Canada to Brazil later.

Example 2:

Girl 1: Did you just see that hot guy?
Girl 2: Yeah, I checked him out from Canada to Brazil.