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Originally an awesome song by Kool n the Gang, one of their few songs that has real chord changes, "Dujii" refers to marijuana.
Dude, that dujii made Ronnie's Groove sound about 10x better!

"Dude, have you heard that tune 'Dujii'?"

"'Dujii!' What are you smoking, man? Dujii?"
by constable ardubsky March 04, 2014