heehaw Share definition Flag the appalling, nasal whining that comes out of jen's mouth when she "sings" oh god she's heehaw'ing again, COME BUY YOUR EARPLUGS, GOT A 2 FOR 1 DEAL!! heehaw by anonymous fictitious June 10, 2009 0 0 Get merch Get the heehaw mug. Buy Now — $32.95 See more merch