IWKYN Share definition Flag An acronym said meaning 'I will kill you now', used typically in moments of extreme frustration, anger, or rarely excitement. WTF dude, how could you sleep with my sister?! IWKYN! IWKYN by eanlain December 8, 2010 0 0 Get merch Get the IWKYN mug. Buy Now — $32.95 See more merch