owninja Share definition Flag The practice of owning so hard that one is effectively uber-1337. <1337-h4x0r>: D00d! We h4x0r3d like 4 different chix0rz boxes last night! <teh-geh>: W00t! You're a owninja! owninja by skoaner October 17, 2004 0 0 Get merch Get the owninja mug. Buy Now — $32.95 See more merch