cowlick• His hair was cut short with a cowlickdropping over at the front, like a freakster.• I can't brush this dumbcowlick down.• First, the cowlick had miraculously disappeared.• He still wears a sailorsuit, the cowlick at his hairline gives his forelock a life of its own.
Origincowlick
(1500-1600) Because it looks as if it had been licked by a cow