1: The ungodly manner in which Simon Cowell half parts and half spikes his hair; a horribly fashioned hairdo in which the hair is parted down the center and one side sits higher than the other... the hair is usually a mixed look of flat and spiked, as if the person sat a book on their head for 5 hours after showering.
2: A type of hair fail for douchebags.
TJ: Did you see X Factor last night?
Sara: No, I don't watch it, I can't stand Simon Cowell and his nappy hair.
TJ: Oh you mean the "Cowell lick"?