A thatch of hair cascading out the back of an athlete's helmet, such that the helmet itself seems to have sprouted a mullet.
Sure, the Dolphins' one-and-only "Rasta Running Back" Ricky Williams may lack dedication on the football field. But when it comes to cultivating a first-rate helmullet, he was nearly peerless in his heyday.
by ColdMiser January 20, 2006
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