dona juanita, n. — Green’s Dictionary of Slang

dona juanita n.

[lit. ‘lady Jane’; play on Mex. marijuana, i.e. Mary Jane]

(drugs) marijuana.

1938		R.P. Walton Marihuana.
1955		H. Braddy ‘Narcotic Argot Along the Mexican Border’ in AS XXX:2 86: BOY, n. Heroin, as opposed to girl, cocaine, and Dona Juanita, marijuana.
1957		El Paso Herald (TX) 3 Oct. 17/4: A few examples of [...] ‘calo’ [...] Dona Juanita — marihuana.
1980		‘Gloss. of Drug Terms’ National Instit. Drug Abuse.