NIWITs Share definition Flag North Idaho White Trash, usually found in northern Idaho towns such as Cour de Lane or Wallace. Those NIWITs are straight up trashers whith their Nascar hats and wife beaters. NIWITs by montana_coltrain September 27, 2011 0 0 Get merch Get the NIWITs mug. Buy Now — $32.95 See more merch