A sex act, in which the female straddles the male and proceeds to quickly move her head in a circular motion, making her hair "whip" accross her partner(s) face.
See kinky
A hair whip is hair that is in some sort of braid or a pony-tale that whips you in the face when a person quickly moves his or her head back and forth quickly.
Person 1: Sorry,sorry, did i hit you? *to the person behind*
You don't care what people say because of the sheer power your hair has against your foes. Haters gonna hate but they can get a real good whipping by your hair or make things feel less boring in your life! Willow makes a perfect example of this by painting people's clothes and walls and making everything less boring in the her school.
Willow's special ability whip my hair back and forth can kill Chuck Norris's beard