What is Belle De Jour?
1.
1) The pseudoym used on, and the name of, a phenomenally successful British web blog apparently written by a prostitute.
2) noun: An high-class call girl.
3) verb: to have a hugely successful Internet blog.
4) noun: a mysterious/anonymous person.
3) "I wonder who sent me that Valentine's Card. They signed it Belle de Jour style."