The garbage man just said, "Indecipherable French stuff mais oui?" followed by a big smile. Maybe what he said was, "Isn't it a coincidence that you are coming home with your bag of lentils and chocolate just when we have reached your apartment to take your garbage away, and you have forgotten to put it out, mais oui?"
"Mais oui!" I replied.
For all I know, I have agreed to go out dancing with him on New Year's Eve.