This is news to me, I have always called cocaine either powder, girl, soft, or paint... crack is hard, chips, lays, or sometimes work some call it, myself included.. its a reference to cash money and the hot boys/big tymers.. I believe they started that slang term for crack, calling it work, because it is their form of "working", so they say I got that work a lot in the old cash money albums.. which I love btw. Heroin is boy, brown, H, and tons of others... i usually just say "boy", or said that when i still did it.. But never heard of slow/fast being a slang term for them.. huh.