Long hair with several ponytails running from front of the head to the back of the head resembling a mohawk. Unlike normal mohawk, no hair is cut from the sides. The word is a portmanteau of ponytail and mohawk.
Sanjaya Malakar had a ponyhawk on stage in an episode of American Idol 2007.
Ryan Seacrest: "It’s like a ponytail or like a ponyhawk. There are a lot of little ponytails in there, huh?"