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1.
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?"
by rgo April 08, 2007
 
2.
A hairstyle defined by having a ponytail and a mohawk at the same time. Believed to have originated in Hayes Valley, San Francisco.
That dude at the bar is totally rocking a ponyhawk.
by Pony Hawk February 02, 2008
 
3.
Long hair that is cut in mohawk style, but not spiked up; a tall mohawk in its flaccid state. Called a "ponyhawk" because of its resemblance to a horse's mane.
Darren dyed cut his hair a ponyhawk and dyed it purple.
by Cimmerian Southpaw October 13, 2003