Green’s Dictionary of Slang

maharishee n.

[proper name Maharishi Mahesh Yogi (1917–2008), a popular 1960s guru, espoused by the Beatles and others in search of raised consciousness]

(drugs) marijuana.

[US]E. Folb Runnin’ Down Some Lines 171: Vernacular expressions reflect a corruption, abbreviation, or play on the word itself ([...] mariwegee, maharishi, ’wana).