How can that be used as an expletive?

My teacher said it meant Personally Offended. It can mean anything you wish. It means pissed off in most cases.

It can be written either way.

A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)

The ancient Germanic tribes and the ancient Scandinavians used runes as an alphabet. Prior to that, they used runes for magic purposes, such as casting lots (divination) and spells of protection.

That people wont work.