Reddit reviews Merde!: The Real French You Were Never Taught at School (Sexy Slang Series)
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http://www.amazon.com/Merde-French-Never-Taught-School/dp/0684854279/ref=sr_1_1?ie=UTF8&qid=1368841585&sr=8-1&keywords=merde
http://www.amazon.com/Merde-Encore-French-Taught-School/dp/0684854287/ref=sr_1_3?ie=UTF8&qid=1368841585&sr=8-3&keywords=merde
Oldies but goodies. Le langage populaire is pretty fluid, but if you're already in Paris I would think you'd have plenty of opportunities for exposure to the real deal. Do you spend much time with Francophones?
I'm in a different place from where you are--I'm working on my ear more generally--but I recall coming into possession of a little book called Merde!: The Real French You Were Never Taught at School. That one's nearly twenty years old now, but similar works exist.
Google-fu (or DuckDuckGo, whatever) turned up a big slang dictionary, some flashcards if that's your thing, a blog with examples, and a jumping-off point on YouTube to hear how some of it sounds. Specifically, I ran a search for "French argot," which seems to yield more solid results than do either "slang" or "colloquial French." I hope some of that helps!
Merde!
You should get this book:
http://www.amazon.com/Merde-French-Taught-School-Series/dp/0684854279
It made my French classes a lot more fun.
https://www.amazon.com/Merde-French-Never-Taught-School/dp/0684854279