Shumpei Share definition Flag a high class form of marijuana, originating from the far east in Japan. Shit gets you fucked up, similar to Kush. "Shit, I got fucked UP off that shumpei last night!" Shumpei by Droogie May 24, 2006 0 0 Get merch Get the Shumpei mug. Buy Now — $32.95 See more merch