A cowlick is simply defined as a portion of hair on the top of a person's head that naturally goes in a different direction than the rest of the hair, sometimes resulting in a spiral appearance. Many people with cowlicks attempt to hide them through styling methods. For some people, however, having hair that goes in different directions, like a cowlick, is attractive. For those who desire to give themselves a cowlick or accentuate their existing cowlick, there isn't much to it.
Wash your hair thoroughly with shampoo and conditioner.
Apply hair gel to the portion of hair you wish to create a cowlick from.
Brush the portion of your hair that has the gel in it and that you wish to look like a cowlick in the opposite direction that your hair normally falls. You can brush it horizontally or up, or a combination of both.
Blow-dry all of your hair. Focus on drying the cowlick portion with the hair gel in it.