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 European's head was thought to be square- so it was (and is) an insult to call someone with that ethnic makeup squarehead.

From STEM, an abbreviation short for "Science, Technology, Engineering and Mathematics", a STEMlord is a pejorative term for a particular kind of person who has studied in these areas at university or works in these fields who holds a pretentious, condescending attitude to anyone who has studied in any other fields, particularly the Arts and Humanities. They typically believe themselves to be more "intelligent" and "rational", while generally remaining incredibly ignorant outside of their areas of expertise and having the charisma of a rotting pig's backside.

Contrary to other beliefs, Square Head is not a reference to the WWII helmets that the Germans used. It is used in reference to the common shape in which many Germans heads are shaped. Dominating brow bones and a square jaw are what create this square look.

Ben Lawrence

A literally translated derogatory term used by French-Canadians to describe English-Canadians. But always spoken/written in it's French form. Can be used in a good natured way between friends. Kind of the opposite of "Frog".
Most English-Canadians are unaware of it's usage.

Origin unknown.

A square head is pretty much what it sounds like- a person or thing with a square head.