Meaning

noun street names for marijuana

noun an ignorant or foolish person

noun carbonated drink flavored with extract from kola nuts (`dope' is a southernism in the United States)

originFrom Dutch doop (“thick dipping sauce”), from Dutch dopen (“to dip”), from Middle Dutch dopen, from Old Dutch *dōpen, from Frankish *daupijan, from Proto-Germanic *daupijaną. “Doop” in the sense “narcotic drug” ultimately refers to viscous opium juice, the drug of choice of the ancient Greeks; “insider information” perhaps from knowing which horse had been doped in a race. Sense of "stupid…

Etymology from Wiktionary, CC BY-SA 3.0