black beauties were the drug of choice for truck drivers during the late 60's and early 70's, prior to the advent of methamphetamine
black beauties (also known as black birds or black bombers) are a combination of amphetamine (speed) and dextroamphetamine (active salt in adderall)
"black beauties were the drug of choice for truck drivers during the late 60's and early 70's, prior to the advent of methamphetamine" What is the definition of "black beauties"?