Frizz can be both a noun and a verb. As a noun, frizz is the messy tangle of hair that sits upon your head from time to time. As a verb, “to frizz” means to form your hair into knots, tight curls, or some other snag. We have no idea why someone would *want* to frizz her hair (some straighties still tease their hair!). Still, it’s the result of a mess of hair atop your head.