"stupid person," 1540s (implied in blockheaded), from block (n.) + head; probably originally an image of the head-shaped oaken block used by hat-makers, though the insulting sense is the older one.
n. a stupid person. (See also block.) : Without a blockhead like you to remind me of the perils of stupidity, I might be less efficient than I am.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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