Re: there aren't any derogatory terms used by Canadians to describe their continental cousins
... most of my Canadian friends, when referring to us decoratively, use the term "Yanks" ...
Indeed. I've raked my brains for a while, and I can't come up with anything worse than "Yanks". Occasionally prefixed with "bloody".
On the other hand, if you wish to broaden your vocabulary, there is also this invaluable resource: