Foam Brush is the absurd hairstyle used mainly in the New Jersey/New York Area (males). The entire head has a "spikey" look to it, while a shaved "Shelf" appears at the neck (Gotti Boys). Reffered to as foam brush because of resemblence to a Toilet brush, be it foam or bristle.
"Johnny Jersey over there is sportin a wicked Foam Brush. What a tool."