This is when Friday the 13th collides with Valentines Day. The next "13 Valentines" is in 2009, and it happens about a dozen times per century. But it's also considered the only Friday the 13th, to actually be good, for falling in love.

It's said that good over powers evil when 13 Valentines occurs; when bad boys and girls are able to actually fall in love.
If you combine the two names, Friday the 13th and Valentines day, the natural phrase that has come from this is 13 Valentines.
by KingDon January 27, 2008
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When Valentine's Day comes after Friday the 13th, which occurs approximately every 6.7 years, those who fall in love, are blessed by the angels. According to astronomical data, the average person experiences this phenomenon 13 times during their life cycle. This is known as "Valentines 13."
February, Friday the 13th 2009: At the stroke of midnight, Valentine's Day will touch Friday the 13th. This is how the term "Valentines 13" came to be.
by I love the Number 13 January 1, 2009
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