fishscale

noun2

1. •
   The scale of a fish.
2. •
   (slang) Cocaine, usually of high quality, taken directly off the brick and uncut.

   • The kids out here don't know a flake from a fish—if you asked them what fishscale is, they wouldn't know. [Fishscale is high-grade cocaine powder with few rock-like chunks.] — 1989