Boinj Share definition Flag Pronounced boy-in-j. It is the act of doing something stupid while high on weed. Specifically weed. Other words- boinjed, boinjing 'Have you seen Kenneth?' 'Yeh, he was boinjing down Kose road last I saw.' Boinj by K9123 January 30, 2024 0 0 Get merch Get the Boinj mug. Buy Now — $32.95 See more merch