street name

noun2

1. •
   The slang term for a drug when it is traded as a street drug.

   • They said they'd never heard of medetomidine, but when the cop referred to it by its street name — rhino tranq — their ears perked up.
2. •
   A person’s nickname on the street, such as a gangster or mafia name; (loosely) any nickname.

   • They said they'd never heard of Mister Dzhugashvili, but when the cop referred to him by his street name — Stalin — their ears perked up.