squarehead

[ skwair-hed ]
/ ˈskwɛərˌhɛd /

noun Slang.

a stupid person.
Extremely Disparaging and Offensive.
  1. a contemptuous term used to refer to a German or Dutch person.
  2. a contemptuous term used to refer to a Scandinavian, especially a Swede.

Origin of squarehead

An Americanism dating back to 1905–10; square + head