Cinq à Sept
Literal translation... 5 o'clock to 7 o'clock.
Meaning...the term cinq à sept refers to that magical period of time when you can sneak out of work without your boss noticing, spend two hours with your lover, and still be home in time for dinner with your spouse which is typically served around 8 o'clock.
Real life examples of this expression in action....Ex 1. "Who is Lilly? Oh. She is my cinq à sept...if you know what I mean". Now I do. Ex 2. "Christine, I am really enjoying you as my English tutor, can we do next week's lesson from.. oh I don't know... cinq à sept?!". Classy.
Baise en ville
Literal translation... a screw in the city.
Meaning... a small men's handbag that is just large enough to contain a toothbrush, tie and change of shirt. Everything you need when you have a sexy overnight date in the city, a longer version of a cinq à sept, one might say.