Definition of dopes:
(n) :
(uncountable, slang) Any of various recreational substances:
(n) :
An opiate, now particularly heroin.
(n) :
Marijuana.
(v) :
(intransitive, now chiefly sports) To use drugs; especially, to use prohibited performance-enhancing drugs (PEDs) in sporting competitions.
(n) :
(countable, slang, derogatory) A stupid person.
(adj) :
(slang) Amazing; cool.