Denseweed Share definition Flag Noun: Someone who has the physical characteristic of a very thick skull; thereby not being able to understand simple things. Used as an insult. We called him "Denseweed" as he didn't understand that 2 plus 2 equaled 4. We weren't being kind." Denseweed by Oilba1 July 31, 2016 0 0 Get merch Get the Denseweed mug. Buy Now — $32.95 See more merch