Your French is solid. Then two Parisians start talking and you catch one word in three. This free guide gives you the 86 slang words and expressions they actually use: le fric, avoir la flemme, être à l'ouest. All of them have been standard for thirty years, and none of them are going anywhere.
Textbook French prepares you for the news, not for the table next to you at the café. The gap isn't grammar. It's register: the words that show up in almost every real conversation and in almost no classroom.
Every expression has been in daily use for at least thirty years. No internet slang that expires next spring.
Each entry comes with a sentence written the way it is really said, so you recognise it at conversation speed and not just on paper.