bonja Share definition Flag A word describe bad weed. Derived from Bogus or bad and Ganja, the word Bonja is commonly used by beatnicks who smoke marijuana. Dude, I'm trying to get high but all I have is this crappy bag of bonja. bonja by Day Dreama August 2, 2007 0 0 Get merch Get the bonja mug. Buy Now — $32.95 See more merch