Cheeser/Cheesehead is a slur used to describe Canadians in a derogatory way. Used primarily in northern Washington State. Refers to Canadians who cross the border to shop for big blocks of inexpensive American Cheese.
The word Cheeser/Cheesehead is a racial slur that has been used historically to degrade and dehumanize canadians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to canadians. If you are unsure about whether or not it is appropriate to use the word Cheeser/Cheesehead, it is best to err on the side of caution and avoid using it in any situation.