Yeah, OK, "jar" means a glass or a mug, but what does that glass look like? Do I order a "jar," or do I specify a "jar of Bushmills"?

If I order a jar, how much do I get?
Is it on ice, mixed or diluted, or what? Dictionaries describe only so much - I'm looking to find out exactly what the idioms are, and what they mean. I'm looking for language that would allow me to order things in a pub of today, 50 years ago, and a hundred years ago. I want to be able to order something - or sing about tomething - and not sound like a rube.

Actually, I have this problem in bars in the U.S., too. I don't know the language, so I end up ordering what I always have, or I say "I'll have what he's having." Sometimes, I listen to the way the locals order, and try to order the same way - sometimes with unpleasant results.

When I lived in Germany, it was worse. In Italy a couple years ago, moreso.

So, can anybody teach me the language, so I can be cool in pubs in Ireland?


-Joe-