The term 'Canadian Blockhead' is a slang term used to describe someone who is considered to be foolish or silly. The crossword solution for this term is 'Hoser, ' which is another slang term used in Canada to describe someone who is considered to be unsophisticated or uncultured. It is often used as an insult and is derived from the Canadian stereotype of rural people who wear rubber boots, known as 'hosers.'