Backyard Wack Share definition Flag Substandard Ghetto Weed. Low Quality weed one notch lower than Backyard Boogie. I tried to get some KGB, but theres nothing around but Backyard Wack! Backyard Wack by Bobby Brooks January 10, 2005 0 0 Get merch Get the Backyard Wack mug. Buy Now — $32.95 See more merch