retarted?
Obviously he is employing the older use of the word, "tart," noun, a woman considered to be sexually promiscuous or a prostitute. These woman were at one point, tarts, but had become normal since coming to the United States of America at some point. Upon their return to Canada, they "retarted" themselves, leading to their awkward appearances and odd demeanor. I say a return to Canada, because in the 15 seconds I watched of the video they did not pull the "duck face" once. This duck face has become a staple of American tart culture and its lack of appearance is a red flag. More specifically, a flag consisting of a red field with a white square at its center, in the middle of which is a red maple leaf.
Canada.
The duck face you are referring to was popularized in the late 2000s, it has since become less popular for females to do in this decade, thus you can not use it to determine their origins. Although there were no duck faces present in that video, there were some signs of Americanism that is nonexistent here in Canada. Firstly, the girl driving used her hands to motion a trigger pull on a gun (a weapon commonly used by Americans). Secondly, as I previously stated the backseat passenger is carrying a small dog, possibly trying to mimic Paris Hilton (an American icon idolized by retarded American females). Lastly, I'd like to remind you that they got the national colo(u)rs of Canada wrong by stating it was red, white AND black. Unless you are colo(u)r blind and/or received no education, it is impossible for a Canadian to incorrectly state the colo(u)rs of our flag. The only logical conclusion one can draw from this video is that those females are in fact from the United States of America visiting Canada for the weekend and regardless of where they come from, they are indeed mentally retarded and should be terminated.