We've all heard them from time to time. They are those mysterious expressions which are quintessentially of the UK and sound quite odd to North American ears. They are one of the most endearing traits of Britons, I think.

For instance...

"tosser"

I have been called a tosser on many occasions by a certain member of the British Isles who posts on this forum. It was puzzling. I'm not a baseball pitcher or anything like that. I wasn't sure what he meant, but I gathered from the context that it wasn't anything good.

Still, I was not sure just how insulted I ought to be when called a "tosser". Should I shrug it off, or should I get really upset? Should I consider legal action? Should I hire someone professional to quietly deal with the situation? Decisions, decisions.

Anyway, "tosser" is definitely a good one. It has staying power.

Here's another: "git" It seems to mean something a bit similar to a tosser, but one is never simply a git. One is a stupid git. If there are any intelligent gits around, they are clearly keeping a very low profile.

Then there's "gobsmacked". I love that one! So expressive.

So we have:
tosser   
stupid git    and   
gobsmacked

Three great UK expressions.

Would anyone like to suggest some others?