niftious Share definition Flag (nift-chus) n. The state of being nifty, interesting, distinctive, cool, ect. Also a term used to describe good progressive rock from Canterbury during the 1970's. John: I'm not lame, gay or full of shit. What am I? Me: Fuckin' niftious. niftious by houlgrave October 8, 2008 0 0 Get merch Get the niftious mug. Buy Now — $32.95 See more merch