I think the Canadian sense of humor is dryer than America's and juicier than Britain's. I think it's a cross between the two of them, really.

This quote means that the Canadian sense of humor is similar to that of both the United States and Britain, but somewhat different. It suggests that the Canadian sense of humor is dry, like that of the United States, but also has some ‘juiciness’, which is a term people use to describe humor that is more refreshing and vibrant than that of the United Kingdom. In other words, the Canadian sense of humor is a combination of the two cultures, with a bit of a twist.