Slang for a mentally retarded person. Just like the word "retard" it can be used to call someone stupid that may not be mentally retarded.
Dude, sorry I messed up. I am such a flat head.
a derogatory term for a German American from southern Indiana, particularly from the town of Jasper, Indiana.
I wonder how much beer those flat heads in Jasper will drink this year at their Strassenfest?