black dragon

noun3

1. •
   Oolong tea or any of certain types thereof.
2. •
   Synonym of black tar heroin.
3. •
   (slang) A hyper-melanistic (all black) Asian water monitor.

   • Hyper melanistic water monitors or “black dragons” are a naturally occurring heritable color phase. Black dragons from the Thailand locality, generally are referred to as the subspecies komaini. — 2018