Actually, 'primae noctis' is Latin and means 'first night', which this is for the newlyweds together.
They used the wrong phrase in Braveheart. They should have said 'jus primae noctis' meaning 'law of the first night’, which was the little used law/custom that a lord should have the virginity of all his subject maidens.
Then again, with all of this vanilla stuff it would have been interesting to see something based on the concept of jus primae noctis :)