haidunno Share definition Flag A way of saying "I don't know" that also conveys irritation or despair, as if sighing before beginning to say the phrase. Cave Woman: When you be fixing leaky cave? Cave Man: Haidunno. haidunno by astateofblank July 13, 2004 0 0 Get merch Get the haidunno mug. Buy Now — $32.95 See more merch
