What DOES help is watching French TV with sub-titles. French subtitles, that is. You can learn cool words like mince! and flic.
I got to say "mince!" when I dripped bbq sauce on my shirt on Monday when I snuck off to McDo by myself to enjoy un hamburger et frites without anyone begging me for ice cream.
I heard flic (slang for 'police', or the equivalent of 'cop') at our friend Stephanie's house just this morning when I went for a cafe (I don't drink cafe - how very unFrench!). Her husband owns a small hotel in Morocco and works there three weeks out of every month. She was very tired this morning because not only was her five year-old up all night coughing, but her husband called in the middle of the night saying the flics had come because some guests accused the air-conditioning repairman of stealing 100,000 suisse francs from their room. When the guests refused to pay for their 15 day vacance in Marakech, it was the flic who said they were probably lying, but they all had to go down to the station and file the paperwork. Those nutty Suisse...
Before you know it I might only need ONE dictionary!