I was scanning the Google results for nigritude ultramarine and found this brief discussion, probably the only page on the net that actually discusses "nigritude ultramarine":

Nigritude Ultramarine is really non-sense because the definition of nigritude is Blackness; the state of being black. Ultramarine is either a blue or a purplish blue made of either power of lapis lazuli or made synthetically by heating clay, sodium carbonate, and sulfur together.

Since by saying nigritude ultramarine we are really saying blackness and blue we would be talking about a navy blue or something similar and there fore the two words put together are not very useful or meaningful.

Problem is, it's negritude, not nigritude, he's talking about.

Overview for "negritude"

The noun "negritude" has 1 sense in WordNet.

1. Negritude -- (an ideological position that holds Black culture to be independent and valid on its own terms; an affirmation of the African cultural heritage)

I guess nigritude would be an ideological position that holds excessive bling to be independent and valid on its own terms, at which point (what with the lapis lazuli connection) nigritude ultramarine could possibly be found to have a definitive meaning.