YOU DUN KNOE Share definition Flag Really its just a general saying said in London by the youths of today. It means you don't know for example "You dun knoe the myspace" "My man's a badman, you dun knoe" YOU DUN KNOE by Jt the bigga nigga October 13, 2008 0 0 Get merch Get the YOU DUN KNOE mug. Buy Now — $32.95 See more merch