nithering Share definition Flag Freezing, cold enough to freeze the balls off a brass monkey. Seems to be a Yorkshire term, not surprising, lots of words for cold up there. By Eck! It's nithering out there. Whippet's nearly frozen tut street. nithering by Rattie January 26, 2004 0 0 Get merch Get the nithering mug. Buy Now — $32.95 See more merch