Green’s Dictionary of Slang

beauty n.2

[abbr. black beauty under black adj.]

Biphetamine, a strong amphetamine.

[UK]J. Colebrook Cross of Lassitude 42: Their acceptance of trying pot, stuff, coke, greenies, acid, or beauties.
[US]C. Hiaasen Strip Tease 151: He popped three more beauties, and stepped on the pedal.