Frankly, most days, I have no clue. I pick up words and expressions that I like, so I can pretty much stick "mate", "bloke", "fortnight", "y'all", "nincompoop", "bugger", "ain't" or"for sure" in the same conversation. Not counting more obscure phrases as "going bursar" or "frell".

Same in french. *shrug*

There's as much standard slang french, old Audiard, classic Racine or local patois in my speech. Depends on what I read/watched last. Means I'm fairly good at picking languages quickly, not so good at having a correct, classic expression.
