squarehead

noun3

1. •
   (slang) A foreigner of Germanic origin, especially a German, Dutch, or Scandinavian person.

   • The squarehead bent his chin to his breast and said, "Very well. In an hour." — 1982
2. •
   (slang) A socially conventional or boring person.
3. •
   (slang) An honest person; a non-criminal.