Short for Nike SkateBoarding. Nike's foray into the skateboard shoe market.
Although Nike basketball shoes were already popular among skateboarders during the 80s due to their strong grips and durable ankle support, the Nike SB is the first offical Nike skateboarding shoe.
It's also become somewhat of a pop culture phenomenon with many non-skaters wearing the shoe.
Hey man, that's a fresh pair of Nike SBs!