The degree of nappyness of ones hair. The naptitude is measured in Niggawatts (one may add a prefix to any measurement, i.e. kilo-, mega-, giga-, etc.).
Dylan: What's the naptitude of her hair?
Kevin: I'd say a couple kiloniggawatts.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi