Honky dust

Can be used interchangeably for cocaine (obviously because it's white). But, can also be used as a generic, cover-all term for narcotic powders (kind of like using skoom) or how police refer to all narcotics as dope.

Person1: What's up with that crackhead rolling around in the middle of the street yelling and screaming?
Person2: Probably all hopped up on honky dust. We should call an ambulance before he gets run over.