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1 definition by BlackKat65

 
1.
A term used to describe someone with few or no brains or common sense, resulting from repeated beating of one's head against the wall. An antiquated term from mid-20th century.
Little Joey runs out into the street.. in front of a careening ice-cream truck. Dad yells, "Joey! You flathead! Get out of the street!!"
by BlackKat65 June 21, 2010