'Nigor Mortis' explanation' edit

The quote (taken from Trent D'Arby's album sleeve apparently), says "The name "Nigor Mortis" represents the state between rigor mortis and "vigor mortis", from the stiffness of a corpse to the vitality of life" - and I thought it was just a feeble attempt to gain press coverage by making a pun on 'the n-word' ?! There is no medical definition to be found through Google - except urban dictionary (and their offering is racially offensive).