Squarehead is a slur used to describe Scandanavians in a derogatory way. Shape of head, late 19th/early 20th century American word. Applies to all Scandinavians.
The word Squarehead is a racial slur that has been used historically to degrade and dehumanize scandanavians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to scandanavians. If you are unsure about whether or not it is appropriate to use the word Squarehead, it is best to err on the side of caution and avoid using it in any situation.