Squarehead

[Cami]

[Squarehead] is a late 19th century ethnic slur directed at German and Scandinavian immigrants. The phrase is meant quite literally as a disparaging reference to the [cranial] features, though often just used as a generic ethnic slur against those groups.

Basically the stereotypical shape of a Northern [Europeans] head was thought to be square- so it was (and is) an insult to call someone with that ethnic makeup [squarehead].

[Jason Yan]

A stupid or inept person.