What is Fast-hair?
1.
a word to describe a number of different hairstyles that is combed back or tied back in a way that makes the wearer appear to be going fast all the time. The most common application of this word is the new trend with females who wear their hair in a stylish pony tail complete with a large ramp like projection at the front of their head created by means of hair pins, hair products and really long bangs, giving them the appearance of constantly moving at lightning speed.
The O.C.'s Alex Kelly (she sported it often)