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This is a cover a Grateful Dead song. It is from their 1974 album, Mars Hotel.
The lyrics make reference to several drugs including acid, heroin, PCP, nitrous, ecstasy, mushroom tea, and opium. Both Sublime and the Grateful Dead were closely associated with drugs.
Sublime lead singer Brad Nowell died in May 1996 from a heroin overdose.
The backbeat in this song was taken from "Funky Drummer" by James Brown. An enormous number of songs have used that sample.