My tailor is rich: slang (1)
So, in 6 months from now we'll be leaving France to live our big adventure across the Atlantic Ocean, and it might be a good idea to work on improving our knowledge of American/Canadian-English.
For a start, let's learn some vocabulary... but not the one we can find in books or learn at school, no, slang is much more interesting and useful if you want to succeed in blending in with the local people (but with this cute hint of French (from France not from Quebec) accent of course) so each week (or so) we'll study a new word.
Today's lesson is the noun "buck" 
The first, and original, meaning of the word is "a male deer" (extended to other animals such as goats, rabbits, hares, ferrets).
Of course, it has come to qualify humans as well. Depending on who you are talking about, it can either be a young good-looking or high-spirited or sexually adventurous man or a racial insult to describe a native American or Canadian (native= politically correct for Indian).
But the most commun use of "buck" in North America and Australia is to mean "dollar" (as you can hear in movies: "You owe me twenty bucks."). It comes from the days when buck skin was used as a unit of trade. The dollar has progressively become the main unit of trade but the word has stuck.
According to Wikipedia, the Canadians also use the word "buck" to replace "one hundred", as in "It's very heavy, it must weight a buck-fifty kilos".