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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."
by Seanio March 21, 2004