Volcano Weed Share definition Flag Weed that has been rolled with sulfur and/or small amounts of gunpowder. It doesn't make you more high, just more awesome. He rolled some volcano weed and couldn't stand more than one hit. What a punk. Volcano Weed by SmartyPants83238 April 21, 2009 0 0 Get merch Get the Volcano Weed mug. Buy Now — $32.95 See more merch