Def: ok (Short for d'accord, bien sur.)
What took me so long to pick this colloquialism out from all the conversing going on in Paris? It was only when I was sitting in my doctor's office, waiting for her to turn her attention back to me after taking a phone call, and listening to her say, "d'acc...d'acc...d'acc..." that I picked it up. D'acc? D'acc!