The term Canadian as blacks is indeed the way servers and bartenders have been getting away with complaining about about bad black tippers. It is epidmic in the south- the term and many blacks who eat and drink out. I used to think that it was a myth because in the north and out west where I have tended bar.. it was not much of an issue.. but southern blacks (where I live now) are really the worst tippers on earth.. of course.. my dad is white and from the country and he is just as bad a tipper. So many in my industry say "Damn Canadians". Even my black coworkers.