a word used to make someone agree with you, also many americans think canadians say it in every sentance while americans say it just as much as canadians.
'Yeah, so, I was walking down the streent, eh? and I saw this really cool car.'
General usage:
Instead of
'are you aware of the fact that it is 9.00 and if you don't leave now you'll be late for the hockey game'
you would say
'it's 9.00, eh?'
If you really agree with someone you would say 'I KNOW! Eh?!' emphasising 'know' and the 'eh' with a slight pause between.
Americans have started their own version of this using 'right': 'I know, right?' Although 'right' has more 'confidence' to it than the more passive 'eh?'; but, that's Canada for you, eh?
Coming from a Canadian (where the word was made, no duh),
Eh means anything, really, but usually means YES? or RIGHT? It can also mean RIGHT ON or TOTALLY.
You can only use EH at the end of a sentence, though, and make sure you don't make it a part of a sentence (did that make ANY sense?).