bigg knife Share definition Flag Word used to describe anyone whoa thinks they are awesome at Xbox but they truly suck and everyone knows it but them. Dude stop being such a Bigg Knife. You know I kicked your ass in Halo. bigg knife by Furious Harpo May 31, 2004 0 0 Get merch Get the bigg knife mug. Buy Now — $32.95 See more merch