N451 Share definition Flag 1337 speak for NAZI OMG WTF T34|\/| N451 H4X 2 D4 M4X111!!!111!! (example is written in all caps) N451 by IrishRepublicanArmy June 5, 2004 0 0 Get merch Get the N451 mug. Buy Now — $32.95 See more merch