Combination of smoking meth with hash. Originated in Northern California.
Similar to a "speedball" giving the user a dual powered high of a stimulant and muscle relaxer (depending on which strain of hash you are using) but with no hangover; greatly reduces any withdrawal symptoms from the ice.
Very popular with gay males and club kids.
I got high smoking some smooth black ice last night at the club and then partied all night till dawn in the bed with my gf.