N1C3R Share definition Flag Negative-first-cousin-thrice-removed: great-grandparent or great-grandchild. My great-grandparent is my N1C3R in theory and my great-grandchild is also my N1C3R in theory. N1C3R by KNN128 May 21, 2021 0 0 Get merch Get the N1C3R mug. Buy Now — $32.95 See more merch